Cita APA (7a ed.)

Carr, E. H. (1956). The twenty years' crisis, 1919-1939: An introduction to the study of international relations (2nd ed., repr. 1956.). MacMillan & Co. [etc.].

Cita Chicago Style (17a ed.)

Carr, Edward Hallett. The Twenty Years' Crisis, 1919-1939: An Introduction to the Study of International Relations. 2nd ed., repr. 1956. London [etc.]: MacMillan & Co. [etc.], 1956.

Cita MLA (9a ed.)

Carr, Edward Hallett. The Twenty Years' Crisis, 1919-1939: An Introduction to the Study of International Relations. 2nd ed., repr. 1956. MacMillan & Co. [etc.], 1956.