Carr, E. H. (1964). The twenty years' crisis 1919-1939: An introduction to the study of international relations. Harper Torchbooks.
Lua i Stíl Chicago (17ú heag.)Carr, Edward Hallett. The Twenty Years' Crisis 1919-1939: An Introduction to the Study of International Relations. Nueva York: Harper Torchbooks, 1964.
Lua MLA (9ú heag.)Carr, Edward Hallett. The Twenty Years' Crisis 1919-1939: An Introduction to the Study of International Relations. Harper Torchbooks, 1964.
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