APA (7th ed.) Citation

Barton, G. The World's Greatest Military Spies and Secret Service Agents.

Chicago Style (17th ed.) Citation

Barton, George. The World's Greatest Military Spies and Secret Service Agents.

MLA (9th ed.) Citation

Barton, George. The World's Greatest Military Spies and Secret Service Agents.

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