Cita APA (7th ed.)

Doherty, G. (2011). The secret crusade. Penguin Books.

Cita Chicago (17th ed.)

Doherty, Gordon. The Secret Crusade. London: Penguin Books, 2011.

Cita MLA (9th ed.)

Doherty, Gordon. The Secret Crusade. Penguin Books, 2011.