APA (7th ed.) Citation

Cumming, C. (2002). A spy by nature. Penguin Books.

Chicago Style (17th ed.) Citation

Cumming, Charles. A Spy by Nature. London: Penguin Books, 2002.

MLA (8th ed.) Citation

Cumming, Charles. A Spy by Nature. Penguin Books, 2002.

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