APA (7th ed.) Citation

Serviss, G. P. (2005). A Columbus of Space. Project Gutenberg.

Chicago Style (17th ed.) Citation

Serviss, Garrett Putman. A Columbus of Space. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Serviss, Garrett Putman. A Columbus of Space. Project Gutenberg, 2005.

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