This skill should be used when the user asks to “cite a case”, “format a citation”, “check Bluebook format”, “cite a statute”, “use id. or supra”, “format footnotes”, “cite a law review article”, or needs Bluebook 21st Edition citation guidance. Covers cases, statutes, secondary sources, signals, and short forms.
Citation formatting for law reviews and legal scholarship per The Bluebook: A Uniform System of Citation (21st ed. 2020).
Announce: “I’m using the bluebook skill for citation formatting.”
Invoke this skill for:
For legal writing style: Use /writing-legal skill (Volokh)
For general writing: Use /writing skill (Strunk & White)
If you haven’t verified EVERY element of a citation, DO NOT write it.
Before writing ANY citation:
Guessing reporter volumes or page numbers is NOT HELPFUL — the user publishes with wrong citations that fail verification. Period. </EXTREMELY-IMPORTANT>
Id., supra, and hereinafter REQUIRE a preceding full citation.
Before using ANY short form:
Using id. after intervening citations creates ambiguity. Delete and cite in full. </EXTREMELY-IMPORTANT>
Law review citations use footnote format (Rule 1). Court documents use text format (Bluepages).
FOOTNOTE (law reviews): Smith v. Jones, 500 U.S. 1, 5 (1991).
TEXT (court documents): Smith v. Jones, 500 U.S. 1, 5 (1991)
FOOTNOTE (statutes): 18 U.S.C. § 1001 (2018).
TEXT (statutes): 18 U.S.C. § 1001 (2018)
If writing for a law review and using text format conventions, DELETE and reformat. </EXTREMELY-IMPORTANT>
Before writing ANY citation:
1. IDENTIFY → What type of source? (case, statute, article, book)
2. LOCATE → Find the correct rule in Bluebook
3. VERIFY → Confirm ALL elements (volume, page, court, year)
4. FORMAT → Apply correct typeface and punctuation
5. CHECK → Does this match examples in the rule?
6. WRITE → Only after steps 1-5
Skipping any step produces unreliable citations.
| Excuse | Reality | Do Instead |
|---|---|---|
| “I’m pretty sure that’s the volume” | Pretty sure = wrong | VERIFY with actual source |
| “Id. is close enough” | Intervening cite breaks id. | Use full short form |
| “This signal seems right” | Wrong signals mislead readers | CHECK rule 1.2 examples |
| “The parenthetical isn’t needed” | Parentheticals explain relevance | ADD what the source says |
| “I’ll fix the pinpoint later” | Pinpoints prove claims | ADD pinpoint NOW |
| “Small caps isn’t that important” | Typeface is mandatory | APPLY correct typeface |
| “This abbreviation is obvious” | Wrong abbreviations fail | CHECK tables T6, T10, T12 |
Full citation:
Brown v. Board of Education, 347 U.S. 483, 495 (1954).
Short form (same footnote or five footnotes with no intervening):
Id. at 496.
Short form (different footnote, no intervening):
Brown, 347 U.S. at 497.
Short form (intervening citations):
Brown v. Board of Education, 347 U.S. at 498.
Full citation:
42 U.S.C. § 1983 (2018).
Multiple sections:
42 U.S.C. §§ 1983-1985 (2018).
Short form:
§ 1983 or id. § 1984
Full citation:
Cass R. Sunstein, *On the Expressive Function of Law*, 144 U. Pa. L. Rev. 2021, 2030 (1996).
Short form:
Sunstein, supra note 12, at 2035.
Full citation:
Richard A. Posner, Economic Analysis of Law 45 (9th ed. 2014).
Short form:
Posner, supra note 5, at 52.
| Source Type | Law Review Format |
|---|---|
| Case names | Italics: Brown v. Board |
| Book titles | Small caps: ECONOMIC ANALYSIS OF LAW |
| Article titles | Italics: On the Expressive Function |
| Journal names | Small caps: U. PA. L. REV. |
| Periodical names (non-consecutively paginated) | Italics: N.Y. Times |
| Statutes | Roman: 42 U.S.C. § 1983 |
| Signal | Meaning | Use When |
|---|---|---|
| [no signal] | Direct support | Source directly states proposition |
| See | Implicit support | Source supports but doesn’t directly state |
| See, e.g., | One of several | Multiple sources support; citing representative |
| Cf. | Analogous support | Source supports by analogy |
| Compare ... with | Comparison | Sources illustrate through contrast |
| See generally | Background | Source provides helpful background |
| But see | Contradiction | Source contradicts proposition |
| Contra | Direct contradiction | Source directly contradicts |
Within a single citation sentence, signals appear in this order:
For detailed rules, consult:
references/cases.md - Complete case citation rules (R. 10)references/statutes.md - Statutory and regulatory citations (R. 12-14)references/secondary-sources.md - Books, articles, treatises (R. 15-17)references/short-forms.md - Id., supra, hereinafter rules (R. 4)references/signals-parentheticals.md - Signals, parentheticals, order (R. 1)references/audit-patterns.md - Citation audit patterns and validationreferences/abbreviations.md - Bluebook abbreviation tablesFor edge cases, ambiguous rules, or additional context beyond the reference files, query the Bluebook 21e (2020) notebook:
# Notebook ID: f70a9976-b443-43d5-b5fd-43ff86b2b700
# Query specific Bluebook rules
/Users/vwh7mb/projects/nlm/nlm generate-chat f70a9976-b443-43d5-b5fd-43ff86b2b700 “How do I cite an unpublished opinion under Rule 10.8.1?”
# Get rule clarification
/Users/vwh7mb/projects/nlm/nlm generate-chat f70a9976-b443-43d5-b5fd-43ff86b2b700 “What are the typeface conventions for treaty citations?”
# Verify abbreviation tables
/Users/vwh7mb/projects/nlm/nlm generate-chat f70a9976-b443-43d5-b5fd-43ff86b2b700 “What is the correct abbreviation for ‘Environmental’ in journal names per Table T13?”
When to query the notebook:
Load the specific reference when:
Use with /writing-legal for complete legal scholarship workflow:
/bluebook formats citations correctly/writing-legal ensures argument structure and evidence handling/ai-anti-patterns catches AI writing indicators before submission| Shortcut | Consequence |
|---|---|
| Guessing citation format to save time | You guessed the citation format to save time. The footnote is wrong — your guess undermines the paper's credibility. |
| Skipping verification of reporter/volume | You cited without checking the reporter. The cite is to the wrong volume — your laziness is visible to every reader. |
| Using short form without establishing full citation first | You used a short form before the full citation. The reader can't trace the source — your shortcut created confusion. |
When to delete and restart:
How to restart:
Old: See Smith v. Jones, 500 U.S. at 15. Id. at 20. [intervening cite] Id. at 25.
New: See Smith v. Jones, 500 U.S. at 15. Id. at 20. [intervening cite] Smith, 500 U.S. at 25.
The third cite cannot use id. after an intervening citation.