APA (7th ed.) Citation

Root, W. L. (1945). The secret history of the war. Scribner.

Chicago Style (17th ed.) Citation

Root, Waverley Lewis. The Secret History of the War. New York: Scribner, 1945.

MLA (9th ed.) Citation

Root, Waverley Lewis. The Secret History of the War. Scribner, 1945.