APA (7th ed.) Citation

Volkman. (1994). Spies: The secret agents who changed the course of history. John Wiley & Sons.

Chicago Style (17th ed.) Citation

Volkman. Spies: The Secret Agents Who Changed the Course of History. New York: John Wiley & Sons, 1994.

MLA (9th ed.) Citation

Volkman. Spies: The Secret Agents Who Changed the Course of History. John Wiley & Sons, 1994.

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