Cita APA

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

Citación estilo Chicago

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

Cita MLA

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

Warning: These citations may not always be 100% accurate.