APA (7th ed.) Citation

Davis, R. H. (1990). The spy. Project Gutenberg.

Chicago Style (17th ed.) Citation

Davis, Richard Harding. The Spy. Champaign, Ill: Project Gutenberg, 1990.

MLA (9th ed.) Citation

Davis, Richard Harding. The Spy. Project Gutenberg, 1990.

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