Cita APA (7a ed.)

Cornwell, R. D. (1993). World history in the twentieth century (New ed. 1980, 12th impr.). Longman.

Cita Chicago Style (17a ed.)

Cornwell, Roger Derek. World History in the Twentieth Century. New ed. 1980, 12th impr. London: Longman, 1993.

Cita MLA (9a ed.)

Cornwell, Roger Derek. World History in the Twentieth Century. New ed. 1980, 12th impr. Longman, 1993.