APA (7th ed.) Citation

Wallace, A. R. (2004). Is Mars habitable? A critical examination of Professor Percival Lowell's book "Mars and its canals," with an alternative explanation. Project Gutenberg.

Chicago Style (17th ed.) Citation

Wallace, Alfred Russel. Is Mars Habitable? A Critical Examination of Professor Percival Lowell's Book "Mars and Its Canals," with an Alternative Explanation. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Wallace, Alfred Russel. Is Mars Habitable? A Critical Examination of Professor Percival Lowell's Book "Mars and Its Canals," with an Alternative Explanation. Project Gutenberg, 2004.

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