APA (7th ed.) Citation

Singer, K. (1955). The world's greatest spies. Allen.

Chicago Style (17th ed.) Citation

Singer, Kurt. The World's Greatest Spies. Lond.: Allen, 1955.

MLA (8th ed.) Citation

Singer, Kurt. The World's Greatest Spies. Allen, 1955.

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