APA (7th ed.) Citation

Beard, C. A. (1965). An economic interpretation of the Constitution of the United States. Free Press [etc.].

Chicago Style (17th ed.) Citation

Beard, Charles Austin. An Economic Interpretation of the Constitution of the United States. New York [etc.]: Free Press [etc.], 1965.

MLA (9th ed.) Citation

Beard, Charles Austin. An Economic Interpretation of the Constitution of the United States. Free Press [etc.], 1965.