MLA

Craig, Gordon Alexander, and Felix Gilbert. The Diplomats: 1919-1939. Princeton: Princeton University Press, 1953.

APA

Craig, G. Alexander, & Gilbert, F. (1953). The diplomats: 1919-1939. Princeton: Princeton University Press.

Chicago

Craig, Gordon Alexander, and Felix Gilbert. The Diplomats: 1919-1939. Princeton: Princeton University Press, 1953.