APA (7th ed.) Citation

Willoughby, W. W. (1929). The constitutional law of the United States (2. ed.). Baker, Voorhis.

Chicago Style (17th ed.) Citation

Willoughby, Westel Woodbury. The Constitutional Law of the United States. 2. ed. New York: Baker, Voorhis, 1929.

MLA (9th ed.) Citation

Willoughby, Westel Woodbury. The Constitutional Law of the United States. 2. ed. Baker, Voorhis, 1929.