APA (7th ed.) Citation

Jeffery. (2010). The secret history of MI6. Penguin Press.

Chicago Style (17th ed.) Citation

Jeffery. The Secret History of MI6. New York: Penguin Press, 2010.

MLA (8th ed.) Citation

Jeffery. The Secret History of MI6. Penguin Press, 2010.

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