APA (7th ed.) Citation

Catlin, G. E. G. (1939). The story of the political philosophers. Tudor.

Chicago Style (17th ed.) Citation

Catlin, George Edward Gordon. The Story of the Political Philosophers. New York: Tudor, 1939.

MLA (9th ed.) Citation

Catlin, George Edward Gordon. The Story of the Political Philosophers. Tudor, 1939.