APA (7th ed.) Citation

Morse, E. S. (2013). Mars and its Mystery. Project Gutenberg.

Chicago Style (17th ed.) Citation

Morse, Edward Sylvester. Mars and Its Mystery. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Morse, Edward Sylvester. Mars and Its Mystery. Project Gutenberg, 2013.

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