APA (7th ed.) Citation

Willoughby, W. W. (1903). The political theories of the ancient world. Longmans, Green.

Chicago Style (17th ed.) Citation

Willoughby, Westel Woodbury. The Political Theories of the Ancient World. New York: Longmans, Green, 1903.

MLA (9th ed.) Citation

Willoughby, Westel Woodbury. The Political Theories of the Ancient World. Longmans, Green, 1903.

Warning: These citations may not always be 100% accurate.