APA ציטוט

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

Chicago Style (17th ed.) Citation

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

ציטוט MLA

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