APA (7th ed.) Citation

Roe, E. P. (2004). His Sombre Rivals. Project Gutenberg.

Chicago Style (17th ed.) Citation

Roe, Edward Payson. His Sombre Rivals. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Roe, Edward Payson. His Sombre Rivals. Project Gutenberg, 2004.

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