APA

Willoughby W. W., . (1919). Principles of the constitutional law of the United States. New York: Baker, Voorhis & co.

Chicago

Willoughby Westel Woodbury, . 1919. Principles of the constitutional law of the United States. New York: Baker, Voorhis & co.

Harvard

Willoughby W. W., . (1919). Principles of the constitutional law of the United States. New York: Baker, Voorhis & co.

MLA

Willoughby Westel Woodbury, . Principles of the constitutional law of the United States. New York: Baker, Voorhis & co. 1919.