Citations are to the 20th edition of The Bluebook, A Uniform System of Citation.
NEVER use the two character postal abbreviations for states. Look up the abbreviation for the state in Table 10.1, Geographical Terms, U.S. states, cities, and territories. They use the old style state abbreviations up to four characters in length.
NEVER use "at" before a section (§) or paragraph (¶) symbol. Weird Rule #3 stems from pinciting in Short Form Citations (B4, R4). The word "at" precedes the pincite page number, but Rule 3.3 advises you to never use "at" before a section or paragraph symbol.
Id. § 7. Id. at § 7.
pt. 3, § 4, at 15. pt. 3, at § 4, 15.
¶ 5.06, at 5-31 to -32 at ¶ 5.06
Supra and hereinafter have special rules for their use. They are limited to references to
You must not use "supra" or "hereinafter" to refer to
LOOK UP Rule 4.2 BEFORE USING either term.
Id. has its own rules. LOOK UP Rule 4.1.