APA (7th ed.) Citation

Wilson, R. H. (2007). Out Around Rigel. Project Gutenberg.

Chicago Style (17th ed.) Citation

Wilson, Robert H. Out Around Rigel. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Wilson, Robert H. Out Around Rigel. Project Gutenberg, 2007.

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