APA (7th ed.) Citation

United States & United States. 18th Amendment. (1919). Amendment to the Constitution, 1919. [Government Printing Office].

Chicago Style (17th ed.) Citation

United States and United States. 18th Amendment. Amendment to the Constitution, 1919. [Washington]: [Government Printing Office], 1919.

MLA (8th ed.) Citation

United States and United States. 18th Amendment. Amendment to the Constitution, 1919. [Government Printing Office], 1919.