Cita APA (7th ed.)

Roberts, J. (1992). The penguin history of the world. Penguin.

Cita Chicago (17th ed.)

Roberts, J.M. The Penguin History of the World. 3rd.ed: Penguin, 1992.

Cita MLA (9th ed.)

Roberts, J.M. The Penguin History of the World. Penguin, 1992.