APA (7th ed.) Citation

Snell, R. J. (2004). Triple Spies. Project Gutenberg.

Chicago Style (17th ed.) Citation

Snell, Roy J. Triple Spies. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Snell, Roy J. Triple Spies. Project Gutenberg, 2004.

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