APA (7th ed.) Citation

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

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

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