APA and Chicago (Author-Date) follow The Bluebook system for legal citations.

Learn more:

• OWL Bluebook Citation for Legal Materials
• The Bluebook: A Uniform System of Citation (at the reference desk)

A case or court citation includes:

• Title or name of the case.
  • Usually listed as one party versus another, omit the first names and use only the first party/name
  • Use "v." between parties' names, for example, Brown v. Board of Education
• Source of the case (cases are printed in volumes called a "Reporter" or "Case Reporter"):
  • The volume of the reporter 
  • Reporter name (abbreviated, see examples below for Reporter names and abbreviations)
  • Page (first page of the opinion)
• (Court* and Date); in parentheses.
  • Court level and location (District Court, Circuit Court, State Court; abbreviated, see the examples below and the U.S. Court abbreviations list). 
  • The year of the decision
  • *omit the name of the Supreme Court
• URL
  • Where you found the case online.
  • This is optional but helps your reader retrieve the information. 

Example:

• Reference list citation: Brown v. Board of Education, 347 U.S. 483 (1954).
• In-text citation: (Brown v. Board of Education, 1954).

The decision for Brown v. Board of Education appears in Volume 347 of the United States Reports (abbreviated U.S.) on page 483, and it was decided in 1954. Note. The name is in italics in the "short form" of the citation, the in-text citation.

The U.S. Supreme Court decisions are published in the United States Reports (abbreviated U.S.). Cite the Supreme Court decision as published in the United States Reports whenever possible; cite the Supreme Court Reporter for cases not yet published in the United States Reports.

• Include both the volume number of the United States Reports and the page number if available (at the time of this writing page numbers are only available for decisions published before 2015). Use three underscores instead of a page number in the reference entry. 
• To find case citations for U.S. Supreme Court decisions go to Oyez.org. 

General Format:

Name v. Name, Volume U.S. Page (Year). URL

In-text citation: (Name v. Name, Year)

Examples:

Burnwell v. Hobby Lobby Stores, 573 U.S. 682 (2014). https://www.oyez.org/cases/2013/13-354

In-text citation: (Burnell v. Hobby Lobby Stores, 2014)

Masterpiece Cakeshop, Ltd. v. Colorado Civil Rights Commission, 584 U.S. ___ (2018). https://www.oyez.org/cases/2017/16-111

In-text citation: (Masterpiece Cakeshop v. Colorado Civil Rights Commission, 2018). 

Decisions from the U.S. District Court are published in the Federal Supplements. 

Name v. Name, Volume F. Supp. Page (Court Year). URL

In-text citation: (Name v. Name, Year)

Example:

Panetti v. Drake, 401 F. Supp. 2d 702 (W.D. Tex. 2004). https://law.justia.com/cases/federal/district-courts/FSupp2/401/702/2500384/

In-text citation: (Panetti v. Drake, 2004)

Decisions from the U.S. Circuit Court are published in the Federal Reporter.

Name v. Name, Volume F. [or F.2d, F.3d] Page (Court Year). URL

In-text citation: (Name v. Name, Year)

Example:

McBride v. Maass, 28 F.3d 107 (9th Cir. 1994). https://openjurist.org/28/f3d/107/mcbride-v-maass

In-text citation: (McBride v. Maass, 1994)

Name v. Name, Volume Reporter Page (Court Year). URL

In-text citation: (Name v. Name, Year)

Example:

Bridges v. State, 863 So. 2d 366 (Fla. Dist Ct. App. 2003). https://casetext.com/case/bridges-v-state-37

In-text citation: (Bridges v. State, 2003)

General Format

The official name of the act. | Section symbol  | U.S.C. Title Number | Abbreviation of code cited

Example of Federal Statute

National Environmental Policy Act of 1969. § 102, 42 U.S.C. § 4332.

Example of State Statute

Consumer Credit Code, Okla. Stat. tit. 14A, § 6-203 (1996). 

The Declaration does not need to be included in your works cited page and can be referenced in your paper along with the paragraph being cited. Ex: "... in the Declaration of Independence para. 2 (U.S. 1776)."

Format:
U.S. Const. amend. xxx. Or : U.S. Const. art. xxx, § x.

Example (4th Amendment of the Constitution):
U.S. Const. amend. IV.

In-text citation: (U.S. Const. amend. IV).

Narrative: Amendment IV to the U.S. Constitution...