Chicago: U.S. Supreme Court, "Syllabus," O’brien v. United States, 386 U.S. 345 (1967) in 386 U.S. 345 Original Sources, accessed April 15, 2025, http://originalsources.com/Document.aspx?DocID=9SDTWI55EXLA52S.
MLA: U.S. Supreme Court. "Syllabus." O’brien v. United States, 386 U.S. 345 (1967), in 386 U.S. 345, Original Sources. 15 Apr. 2025. http://originalsources.com/Document.aspx?DocID=9SDTWI55EXLA52S.
Harvard: U.S. Supreme Court, 'Syllabus' in O’brien v. United States, 386 U.S. 345 (1967). cited in 1967, 386 U.S. 345. Original Sources, retrieved 15 April 2025, from http://originalsources.com/Document.aspx?DocID=9SDTWI55EXLA52S.