APA (7th ed.) Citation

Burroughs, E. R. (1993). A princess of Mars by Edgar Rice Burroughs. Project Gutenberg Literary Archive Foundation.

Chicago Style (17th ed.) Citation

Burroughs, Edgar Rice. A Princess of Mars by Edgar Rice Burroughs. Salt Lake City: Project Gutenberg Literary Archive Foundation, 1993.

MLA (9th ed.) Citation

Burroughs, Edgar Rice. A Princess of Mars by Edgar Rice Burroughs. Project Gutenberg Literary Archive Foundation, 1993.

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