APA (7th ed.) Citation

Burroughs, E. R. (1993). Warlord of Mars. Project Gutenberg.

Chicago Style (17th ed.) Citation

Burroughs, Edgar Rice. Warlord of Mars. Project Gutenberg, 1993.

MLA (9th ed.) Citation

Burroughs, Edgar Rice. Warlord of Mars. Project Gutenberg, 1993.

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