Style de citation APA (7e éd.)

Sumner, W. G., & Keller, A. G. (1914). The challenge of facts, and other essays. Yale University Press.

Style de citation Chicago (17e éd.)

Sumner, William Graham, et Albert Galloway Keller. The Challenge of Facts, and Other Essays. New Haven: Yale University Press, 1914.

Style de citation MLA (9e éd.)

Sumner, William Graham, et Albert Galloway Keller. The Challenge of Facts, and Other Essays. Yale University Press, 1914.