APA (7th ed.) Citation

West, N. (1991). Seven spies who changed the world. Secker & Warburg.

Chicago Style (17th ed.) Citation

West, Nigel. Seven Spies Who Changed the World. London: Secker & Warburg, 1991.

MLA (9th ed.) Citation

West, Nigel. Seven Spies Who Changed the World. Secker & Warburg, 1991.

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