APA (7th ed.) Citation

Marlowe, S., & McCauley, H. W. (2010). The Graveyard of Space. Project Gutenberg.

Chicago Style (17th ed.) Citation

Marlowe, Stephen, and Harold W. McCauley. The Graveyard of Space. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Marlowe, Stephen, and Harold W. McCauley. The Graveyard of Space. Project Gutenberg, 2010.

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