Cita APA (7a ed.)

Aylett, J. F., & Page, P. (1991). The twentieth century world (1. publ.). Hodder & Stoughton.

Cita Chicago Style (17a ed.)

Aylett, John F., y Philip Page. The Twentieth Century World. 1. publ. London: Hodder & Stoughton, 1991.

Cita MLA (9a ed.)

Aylett, John F., y Philip Page. The Twentieth Century World. 1. publ. Hodder & Stoughton, 1991.