APA (7th ed.) Citation

Campbell, J. W. (2007). The Ultimate Weapon. Project Gutenberg.

Chicago Style (17th ed.) Citation

Campbell, John Wood. The Ultimate Weapon. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Campbell, John Wood. The Ultimate Weapon. Project Gutenberg, 2007.

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