APA (7th ed.) Citation

Willis, H. E. (1936). Constitutional law of the United States. The Principia press.

Chicago Style (17th ed.) Citation

Willis, Hugh Evander. Constitutional Law of the United States. Bloomington, Ind.: The Principia press, 1936.

MLA (9th ed.) Citation

Willis, Hugh Evander. Constitutional Law of the United States. The Principia press, 1936.