Cita APA

Derek O'Brien. (2009). Penguin Year Book 2009. Penguin books.

Citación estilo Chicago

Derek O'Brien. Penguin Year Book 2009. New Delhi: Penguin books, 2009.

Cita MLA

Derek O'Brien. Penguin Year Book 2009. Penguin books, 2009.

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