Cita APA

Thornton, A. P. (1980). Imperialism in the Twentieth Century. Macmillan Press.

Citación estilo Chicago

Thornton, A. P. Imperialism in the Twentieth Century. London ; Basingstoke: Macmillan Press, 1980.

Cita MLA

Thornton, A. P. Imperialism in the Twentieth Century. Macmillan Press, 1980.