APA (7th ed.) Citation

Marlowe, S., & Novick, I. H. (2010). World Beyond Pluto. Project Gutenberg.

Chicago Style (17th ed.) Citation

Marlowe, Stephen, and Irving H. Novick. World Beyond Pluto. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Marlowe, Stephen, and Irving H. Novick. World Beyond Pluto. Project Gutenberg, 2010.

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