APA (7th ed.) Citation

Gettell, R. G. (1924). History of political thought. The Century co..

Chicago Style (17th ed.) Citation

Gettell, Raymond Garfield. History of Political Thought. New York & London: The Century co., 1924.

MLA (9th ed.) Citation

Gettell, Raymond Garfield. History of Political Thought. The Century co., 1924.