APA (7th ed.) Citation

Krepps, R. W. (2010). The Giants From Outer Space. Project Gutenberg.

Chicago Style (17th ed.) Citation

Krepps, Robert W. The Giants From Outer Space. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Krepps, Robert W. The Giants From Outer Space. Project Gutenberg, 2010.

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