APA (7th ed.) Citation

Clark, G. N. (1920). Unifying the world. The Swarthmore press.

Chicago Style (17th ed.) Citation

Clark, George Norman. Unifying the World. London: The Swarthmore press, 1920.

MLA (9th ed.) Citation

Clark, George Norman. Unifying the World. The Swarthmore press, 1920.

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