Willoughby, W. W. (1919). Principles of the constitutional law of the United States. Baker Voorhis and Co..
Chicago Style (17th ed.) CitationWilloughby, Westel W. Principles of the Constitutional Law of the United States. New York: Baker Voorhis and Co., 1919.
MLA (9th ed.) CitationWilloughby, Westel W. Principles of the Constitutional Law of the United States. Baker Voorhis and Co., 1919.