APA (7th ed.) Citation

Souvestre, P., & Allain, M. (2009). A Nest of Spies. Project Gutenberg.

Chicago Style (17th ed.) Citation

Souvestre, Pierre, and Marcel Allain. A Nest of Spies. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Souvestre, Pierre, and Marcel Allain. A Nest of Spies. Project Gutenberg, 2009.

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