Cita APA (7a ed.)

Black, J. (2002). The world in the twentieth century. Longman.

Cita Chicago Style (17a ed.)

Black, Jeremy. The World in the Twentieth Century. London ; New York: Longman, 2002.

Cita MLA (8a ed.)

Black, Jeremy. The World in the Twentieth Century. Longman, 2002.