Cita APA (7th ed.)

Carr, E. H. (1966). The Twenty years crisis ; 1919-1939: An introduction to the study of international relations (2nd ed.). Macmillan.

Cita Chicago (17th ed.)

Carr, Edward Hallett. The Twenty Years Crisis ; 1919-1939: An Introduction to the Study of International Relations. 2nd ed. London: Macmillan, 1966.

Cita MLA (9th ed.)

Carr, Edward Hallett. The Twenty Years Crisis ; 1919-1939: An Introduction to the Study of International Relations. 2nd ed. Macmillan, 1966.