APA (7th ed.) Citation

Williams, R. M. (2010). Planet of the Gods. Project Gutenberg.

Chicago Style (17th ed.) Citation

Williams, Robert Moore. Planet of the Gods. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Williams, Robert Moore. Planet of the Gods. Project Gutenberg, 2010.

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