APA način citiranja (7. izdanje)

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

Čikaški stil citiranja (17. izdanje)

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

MLA način citiranja (9. izdanje)

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