APA (7th ed.) Citation

Davis, R. H. (2006). The Spy. Project Gutenberg.

Chicago Style (17th ed.) Citation

Davis, Richard Harding. The Spy. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Davis, Richard Harding. The Spy. Project Gutenberg, 2006.

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