APA (7th ed.) Citation

Seltzer, C. A. (2006). The Two-Gun Man. Project Gutenberg.

Chicago Style (17th ed.) Citation

Seltzer, Charles Alden. The Two-Gun Man. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Seltzer, Charles Alden. The Two-Gun Man. Project Gutenberg, 2006.

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