APA (7th ed.) Citation

Willoughby, W. W. (1930). Principles of the constitutional law of the United States (2d ed.). Baker, Voorhis & co..

Chicago Style (17th ed.) Citation

Willoughby, Westel Woodbury. Principles of the Constitutional Law of the United States. 2d ed. New York: Baker, Voorhis & co., 1930.

MLA (9th ed.) Citation

Willoughby, Westel Woodbury. Principles of the Constitutional Law of the United States. 2d ed. Baker, Voorhis & co., 1930.