APA aipamena

Roberts, J. M. (1980). The Pelican history of the world. Harmondsworth: Penguin Books.

Chicago Style aipamena

Roberts, J. M. The Pelican History of the World. Harmondsworth: Penguin Books, 1980.

MLA aipamena

Roberts, J. M. The Pelican History of the World. Harmondsworth: Penguin Books, 1980.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.