Cita APA (7a ed.)

Mills, H. (1987). Twentieth century world history in focus (Repr.). Macmillan.

Cita Chicago Style (17a ed.)

Mills, Harry. Twentieth Century World History in Focus. Repr. Basingstoke: Macmillan, 1987.

Cita MLA (9a ed.)

Mills, Harry. Twentieth Century World History in Focus. Repr. Macmillan, 1987.