APA (7th ed.) Citation

Stringer, A., & Snapp, F. (2010). The Man Who Couldn't Sleep. Project Gutenberg.

Chicago Style (17th ed.) Citation

Stringer, Arthur, and Frank Snapp. The Man Who Couldn't Sleep. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Stringer, Arthur, and Frank Snapp. The Man Who Couldn't Sleep. Project Gutenberg, 2010.

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