Build a citation you can explain

Opening problem

A writer attaches a URL to a claim and assumes the citation is complete. The link opens a homepage, the relevant report has moved, and the cited paragraph was changed after retrieval. A useful electronic citation identifies the item, not merely a route to a site.

Learning objectives

Classify underlying sources before treating them as websites; collect authors, titles, dates, URLs, and locators; distinguish exact copies from independent online publications; record mutable sources; and audit link destinations.

Delivery method and source type

A judicial opinion downloaded from an official website remains a judicial opinion. A scanned statute remains a statute. A book PDF remains a book. When an authenticated, official, or exact online copy supplies the normal source's identifying information, use the equivalent print citation without a URL under the electronic-copy convention. Other online copies may call for an added access URL; a receiving instruction can specify another treatment. Do not discard meaningful reporter or section data merely because the file arrived through a browser.

An independently published web article, agency guidance page, blog post, dataset, or audiovisual item has its own identification needs. Determine what it is, who issued it, when it was published or updated, and which location supports your sentence. A URL without those fields can leave the reader unable to reconstruct the source if the link changes.

Annotated real access model

Brown v. Bd. of Educ., 347 U.S. 483, 495 (1954), https://www.courtlistener.com/opinion/105221/brown-v-board-of-education/.

The URL is an access supplement here. It does not turn the CourtListener cluster number into a reporter citation or independently certify the decision's current legal status. Some receiving formats may omit the supplemental URL when the reporter citation suffices; check the actual requirement.

A web source card

Collect the author or responsible institution, item title, site or publication name, publication or update date, direct URL, and the passage's actual locator. Separate the date on the item from the date you opened it. A browser download timestamp is not publication information, and a site's contact person is not necessarily its author.

Use the publication date when supplied. If there is none, use a supplied last-modified or last-updated date with its appropriate label. If neither exists, the last-visited treatment records access. The date's label matters: a reader should be able to tell whether a page was published, changed, or merely visited on that date.

Dates and versions

Publication, update, archive, and access dates describe different events. An archived capture date shows when a snapshot was made; it does not necessarily show when the underlying material was first published. An update date can reflect a small correction or major rewrite. Save the source version used and compare it if your final text relies on a mutable passage.

Fictional training example — not legal authority. Packet: Harbor Records Office, “Filing Checklist,” Harbor Records Site, posted May 1, 2025; paragraph titled “Signatures” states that checklist users should sign the cover sheet. A direct fictional URL is supplied for training only: https://example.org/harbor/checklist. The sentence should attribute that recommendation to the checklist. It does not prove a court requires the signature unless an operative rule says so.

A training citation can identify the office, italicized item title, site, date, and URL. A locator naming the “Signatures” heading is more useful than a fabricated page 1. If the assignment asks for a pinpoint and no stable numerical locator exists, a heading or other accurate locator can improve navigation without inventing pagination.

Stable links and archived copies

Use an item link that reaches the cited material. A homepage leaves the reader to search again; a session-bound search link may work only in your browser. Test a shortened or cleaned URL before substituting it. Removing tracking parameters is useful only if the remaining address still identifies the correct item.

A preserved copy helps when wording changes. Save the version used and identify its publication or update information. A SHA-256 checksum can help determine whether the saved bytes later changed; it does not establish that the original source was accurate or legally operative. Preserve linked attachments separately when your proposition depends on them.

An archive capture can provide an earlier version, but inspect what it actually captured. A working landing page with a missing attachment does not preserve the attachment's contents. The capture date identifies the snapshot, not the original publication event. Observe applicable rights and confidentiality limits when saving or sharing copies.

Nontext electronic materials

A video or audio item may need speaker/creator, title, publisher/platform, date, URL, and a timestamp locator. A dataset may need creator, title, version, release date, and the exact subset or record relied on. A social post's handle is not necessarily its author's legal identity. Record what is actually supplied and avoid unsupported identity claims.

Use the medium's actual structure. A dataset release needs a version and reproducible selection; a recording needs an interval; a post may need its original posting time. The webpage pattern supplies useful identity fields, but a receiving publication may prescribe a more specific arrangement.

Link and proposition checks

Open the final direct URL. Confirm that its title/version matches the citation and its passage supports the sentence. Check whether a link redirects to a new edition or a different item. Test the link after export, where line wrapping and punctuation can break destinations. A working HTTP response is only a transport check; it is not a substantive review.

Common mistakes and repairs

Compact reference

Classify item → identify creator/title/version/date → select real locator → provide direct access URL → record retrieval → compare passage with sentence → test exported link.

Worked editing session: evaluate an online copy

Fictional training example — not legal authority. A fictional Harbor website offers three items: a paginated opinion PDF, a checklist titled “Filing Checklist,” and a news summary of the opinion. The summary links to the PDF but omits a qualification in its discussion of the court's reasoning.

A draft says, “The court permits every unsigned filing,” and links to the summary. Start with the asserted speaker: the court. Open the opinion, find the relevant passage, and read its qualification. Cite the opinion if the revised sentence describes the court's reasoning. If you only discuss how the summary describes the decision, attribute the description to the summary. The host's common address does not make the three items one source.

For the checklist, inspect the page itself. The packet identifies Harbor Records Office as author, Harbor Records Site as the site, May 1, 2025 as the posting date, and “Signatures” as the heading recommending a signed cover sheet. Those fields produce a web citation. They do not supply a reporter, docket number, or page count. A browser's printed page 1 is a temporary output coordinate, not a page assigned by the checklist.

Now suppose the checklist's direct URL redirects to a June revision saying the office accepts an unsigned cover sheet. Decide what your sentence is about. A history of the May recommendation needs the preserved May version. A description of the June recommendation needs the revised passage and date. Simply retaining the May citation beside the new link leaves the reader looking at evidence that contradicts the sentence.

Test both identity and location. A page can load correctly while its old section anchor no longer works. The title can match while the relevant attachment has changed. Follow the final citation exactly as a reader would: open the item, identify its version, and reach the claimed passage.

Advanced workshop: select the electronic citation route

The electronic-source conventions draw distinctions that a blanket “always add a URL” rule misses. An authenticated, official, or exact online copy is cited as the equivalent print source without URL information. A print source available online can receive an access URL when that materially improves retrieval under the supplemental-access convention. An online source with the identifying features and fixed pagination of a print source uses the corresponding source form plus a URL under the print-analog convention. A standalone webpage follows the webpage formula. The task is to classify the copy, not merely notice that it has a web address.

An exact copy preserves the whole printed source and its pagination. A reflowed transcription may preserve the words while changing layout or omitting pagination; do not label it an exact paginated copy without checking. An official host can supply an official document, a summary, a press release, and an archive of superseded documents. Identify the particular item and its status. The government domain alone does not collapse those distinctions.

The CourtListener Brown model in this chapter supplies an optional access route to an inspected transcription. It demonstrates recoverability alongside the conventional reporter citation. It is not a rule that every official or exact PDF citation must carry a URL. The relevant source category and any receiving instruction determine whether that addition belongs in the finished document.

Missing fields and repeated institutional names

Use a personal byline when the source gives one. If no personal author is available, use an apparent institutional author when appropriate. Omit the institutional author when the website title already makes the owner clear. That prevents an unnecessary repetition while keeping the institution identifiable. It does not authorize guessing that a parent organization wrote a separately attributed author's article.

Fictional training example — not legal authority. A page titled “Receipt Guide” has no byline and appears on the fictional Harbor Records Office website. The site title itself identifies the responsible office. Under the supplied facts, Receipt Guide, Harbor Recs. Off., followed by the direct URL and appropriate date treatment, avoids stating the same office twice. If the site title instead obscured the responsible institution, retain the institutional-author field needed for identification. The full citation depends on the source's actual fields, not a fixed number of slots.

If the source supplies a publication date, use it. Include an exact posting time when the convention calls for it, particularly for a source updated through the day. If no publication date exists but the source gives a last-modified or last-updated date, identify that date using the corresponding label after the URL. If none is available, a last-visited date records access. Do not relabel a last-updated date as original publication, or add the present year simply because the page is still reachable.

Archive the right object

A webpage can load text, images, tables, and linked documents through separate requests. A saved copy may contain only some of them. After saving a permitted research copy, reopen it and confirm that it preserves the particular evidence used. If the proposition relies on a linked report's table, save and identify the report itself. A screenshot of the landing page does not preserve the table just because a button to download it remains visible.

A stable item URL is preferable to a search-results URL whose query, filters, and session state are needed to reproduce the result. When a source can only be reached through a database search, record the search instructions and identifying fields accurately rather than substituting the root domain and assuming the reader can infer the path. A navigation parenthetical can explain the steps for unusually unwieldy access routes. Use it sparingly and test the stated steps.

An archived access URL supplements the source's original identity; it does not replace the publication's title or date. Record which capture contains the cited passage. A capture that redirects, fails to load an attachment, or shows a later revision cannot establish the earlier text merely because its calendar date looks suitable. If the needed version cannot be recovered, revise the claim or identify the source limitation.

Versions, data, and audiovisual locators

For a dataset, the relevant object may be a release, a table, a record, or a computed selection. Record its creator, title, release identifier and date, the table or variables used, and the actual selection needed to reproduce the result. Preserve units and any supplied limitations. A citation to a dashboard homepage cannot explain how a particular numerical statement was obtained when the displayed result depends on filters. This is a source-record method; specialized disciplines and receiving publications may prescribe a more specific citation form.

For audio or video, use the actual recording, its speaker or creator, title, platform or publisher, publication information, and a time locator. Verify whether the timestamp measures elapsed time from the recording's start or from a player that skips an introduction. A transcript can be a separate version with edits or missing material. If quoting the recording, compare the words with the recording at the stated time rather than trusting an automatically generated transcript.

Digital sources benefit from one final check after export: open the linked destination, inspect the displayed title and version, and test the locator. A broken anchor can leave the main page accessible while losing the pinpoint. A line-break character accidentally copied into the URL can change its destination. Repair the access path while preserving the actual source identity and version used.

Source laboratory: a visible seal is not a completed signature check

GovInfo's authentication guidance distinguishes a document's identity from its integrity. Identity concerns what the digital publication is and where it came from. Integrity concerns whether its data have been altered. The guidance explains how a PDF's digital signature can supply evidence relevant to those questions and describes validation through suitable software. The presence of an eagle seal on a rendered page is not, by itself, evidence that a validation process ran successfully.

One warning is especially useful to legal researchers. GovInfo explains that creating a new PDF through its described print-to-PDF annotation workaround leaves the visible seal but removes the digital signature. Copying text into another document likewise does not transfer the signature. Thus an annotated working copy may be helpful for analysis while remaining technically different from the preserved downloaded original. Keep both identities clear.

A research card can therefore contain several separate findings: the PDF came from an identified GovInfo item; its bytes were saved at a recorded time; a checksum identifies that saved file; a signature was or was not validated using a stated method; and the relevant passage was read against the proposition. These findings should not collapse into one unexplained “verified” box. A saved original, a matching checksum, and a successful signature-validation result are different findings; state only the checks actually performed.

The guidance also explains why a historical publication may have a much later signature date. Older content can be added to or migrated between systems, and a package can be reprocessed and signed again. A later signature does not automatically turn a 2010 enactment into a newly enacted 2026 law. Read the publication's own identity and date. Keep the signature date, publication date, version information, and retrieval time in separate fields when they matter.

A source citation for the undated guidance is Authentication, GovInfo, https://www.govinfo.gov/about/authentication (last visited Oct. 8, 2026). The site title identifies the institution's publishing service without inventing an individual byline. A source note or pinpoint description can identify the annotation-workaround section when discussing its retained-seal warning. The access date records the inspected undated page; it is not presented as the publication date of the guidance.

Test the next reader's route. Preserve the original downloaded file before making annotations. Give the working copy a distinct filename. Record which file supplied the quotation and whether it was compared with the original. Then check the source's legal role and temporal relevance. Even a successfully validated signature would not prove that an obsolete regulation remains operative or that an advocate's factual assertion is true. Technical integrity supports reliable retrieval; reading and legal analysis determine what the source supports.

Takeaway

Electronic citation needs item identity, version, and support. A link is useful when it leads a reader to the same evidence you inspected.

Chapter source note

Electronic-source conventions draw on The Indigo Book 2.0, R32–R34, including the distinct routes for official or exact copies, supplemental access, print analogs, and independent webpages. The case model uses Brown at 495 through the linked CourtListener copy. Fictional URLs use example.org.

The authentication lesson uses GovInfo, Authentication, inspected October 8, 2026, particularly its explanations of validation, annotation, copied text, and later signature dates. Reading that guidance is distinct from performing cryptographic validation of a particular downloaded file.