APA (7th ed.) Citation

Marsh, R. (2011). A Duel. Project Gutenberg.

Chicago Style (17th ed.) Citation

Marsh, Richard. A Duel. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Marsh, Richard. A Duel. Project Gutenberg, 2011.

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