APA (7th ed.) Citation

Project Gutenberg & Burroughs, E. R. (1993). Warlord of Mars. Project Gutenberg Literary Archive Foundation.

Chicago Style (17th ed.) Citation

Project Gutenberg and Edgar Rice Burroughs. Warlord of Mars. Salt Lake City: Project Gutenberg Literary Archive Foundation, 1993.

MLA (9th ed.) Citation

Project Gutenberg and Edgar Rice Burroughs. Warlord of Mars. Project Gutenberg Literary Archive Foundation, 1993.

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