APA (7th ed.) Citation

Gibbons, H. A. (1923). An introduction to world politics. The Century Co..

Chicago Style (17th ed.) Citation

Gibbons, Herbert Adams. An Introduction to World Politics. New York: The Century Co., 1923.

MLA (9th ed.) Citation

Gibbons, Herbert Adams. An Introduction to World Politics. The Century Co., 1923.