Cita APA

Thornton, A. P. (1978). Imperialism in the twentieth century. Macmillan.

Citación estilo Chicago

Thornton, A. P. Imperialism in the Twentieth Century. London: Macmillan, 1978.

Cita MLA

Thornton, A. P. Imperialism in the Twentieth Century. Macmillan, 1978.