APA (7th ed.) Citation

Maunder, E. W. (2011). Are the Planets Inhabited? Project Gutenberg.

Chicago Style (17th ed.) Citation

Maunder, E. Walter. Are the Planets Inhabited? Project Gutenberg, 2011.

MLA (9th ed.) Citation

Maunder, E. Walter. Are the Planets Inhabited? Project Gutenberg, 2011.

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