APA (7th ed.) Citation

Carr, E. H. (2001). The Twenty years' crisis: 1919-1939 : an introduction to the study of international relations. Perennial.

Chicago Style (17th ed.) Citation

Carr, Edward Hallett. The Twenty Years' Crisis: 1919-1939 : An Introduction to the Study of International Relations. New York: Perennial, 2001.

MLA (9th ed.) Citation

Carr, Edward Hallett. The Twenty Years' Crisis: 1919-1939 : An Introduction to the Study of International Relations. Perennial, 2001.