APA সাইটেশন

Carr, E. H. (1940). The twenty years' crisis, 1919-1939: An introduction to the study of international relations. London: Macmillan and co.

শিকাগো স্টাইলে সাইটেশন

Carr, Edward Hallett. The Twenty Years' Crisis, 1919-1939: An Introduction to the Study of International Relations. London: Macmillan and co, 1940.

এমএলএ সাইটেশন

Carr, Edward Hallett. The Twenty Years' Crisis, 1919-1939: An Introduction to the Study of International Relations. London: Macmillan and co, 1940.