Cita APA (7a ed.)

Roberts, J. M. (1997). The Penguin history of Europe. Penguin Books.

Cita Chicago Style (17a ed.)

Roberts, John Morris. The Penguin History of Europe. London, England ; New York, N.Y.: Penguin Books, 1997.

Cita MLA (9a ed.)

Roberts, John Morris. The Penguin History of Europe. Penguin Books, 1997.