Bluebook 21st Edition Citation

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."

When to Use

Invoke this skill for:

• Formatting case citations (federal, state, foreign)
• Statutory and regulatory citations
• Secondary sources (books, articles, treatises)
• Short form citations (id., supra, hereinafter)
• Introductory signals and parentheticals
• Citation sentences vs. citation clauses

For legal writing style: Use

/writing-legal

skill (Volokh) For general writing: Use

/writing

skill (Strunk & White)

<EXTREMELY-IMPORTANT> ## IRON LAW #1: NO CITATION WITHOUT VERIFICATION

If you haven't verified EVERY element of a citation, DO NOT write it.

Before writing ANY citation:

1. Verify case name spelling and procedural posture
2. Verify reporter volume and page numbers
3. Verify court and year
4. Verify pinpoint page exists

Guessing reporter volumes or page numbers is LYING. Period. </EXTREMELY-IMPORTANT>

<EXTREMELY-IMPORTANT> ## IRON LAW #2: NO SHORT FORMS WITHOUT FULL CITATION FIRST

Id., supra, and hereinafter REQUIRE a preceding full citation.

Before using ANY short form:

1. Locate the full citation in the document
2. Verify no intervening citations (for id.)
3. Verify the supra reference is unambiguous

Using id. after intervening citations creates ambiguity. Delete and cite in full. </EXTREMELY-IMPORTANT>

<EXTREMELY-IMPORTANT> ## IRON LAW #3: FOOTNOTE VS. TEXT CITATION FORMAT

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>

The Gate Function

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.

Rationalization Table - STOP If You Think:

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

Red Flags - STOP Immediately If:

• "Let me guess the reporter volume" → NO. Verify the actual cite.
• "Id. probably works here" → NO. Check for intervening citations.
• "Supra will point them back" → NO. Verify the full citation exists.
• "I'll use the common abbreviation" → NO. Use Bluebook tables.
• "Close enough on the page number" → NO. Exact pinpoints required.

Quick Reference: Common Citation Forms

Cases (Rule 10)

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.

Statutes (Rule 12)

Full citation:
42 U.S.C. § 1983 (2018).

Multiple sections:
42 U.S.C. §§ 1983-1985 (2018).

Short form:
§ 1983 or id. § 1984

Law Review Articles (Rule 16)

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.

Books (Rule 15)

Full citation:
Richard A. Posner, Economic Analysis of Law 45 (9th ed. 2014).

Short form:
Posner, supra note 5, at 52.

Typeface Rules (Rule 2)

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

Introductory Signals (Rule 1.2)

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

Signal Order (Rule 1.3)

Within a single citation sentence, signals appear in this order:

1. [no signal]
2. E.g.,
3. Accord
4. See
5. See also
6. Cf.
7. Compare
8. Contra
9. But see
10. But cf.
11. See generally

Common Errors Checklist

Case Citations

• Party names shortened properly (omit "Inc.", "Ltd." unless only identifier)
• "United States" abbreviated to "U.S." (as party, not "United States of America")
• Reporter abbreviation matches T1
• Court identifier included unless obvious from reporter
• Year is decision year, not argument year
• Pinpoint included for specific propositions

Statutory Citations

• Current official code used (not session laws for current statutes)
• Section symbol (§) used, not "Section"
• Space between § and number
• Year is code edition year, not enactment year
• Supplements cited when applicable

Short Forms

• Full citation appears earlier in same document
• Id. used only when no intervening citation
• Supra refers to footnote number where full cite appears
• Hereinafter defined in first full citation

Progressive Disclosure

For detailed rules, consult:

Reference Files

• 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)

When to Load References

Load the specific reference when:

• Formatting an unfamiliar source type
• Encountering edge cases (unpublished cases, foreign sources)
• Checking state-specific reporter requirements
• Working with complex statutory schemes
• Formatting international materials

Integration

Use with

/writing-legal

for complete legal scholarship workflow:

1. /bluebook

   formats citations correctly

2. /writing-legal

   ensures argument structure and evidence handling

3. /ai-anti-patterns

   catches AI writing indicators before submission

Delete & Restart Pattern

When to delete and restart:

1. Citation uses guessed page numbers → Delete, verify source, cite with real numbers
2. Id. follows intervening citation → Delete id., use full short form
3. Wrong signal used → Delete, reread Rule 1.2, apply correct signal
4. Typeface incorrect → Delete, apply Rule 2 typeface
5. Abbreviation doesn't match Bluebook tables → Delete, use table abbreviation

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.