APA (7th ed.) Citation

Sabin, E. L. (2010). Boys' Book of Frontier Fighters. Project Gutenberg.

Chicago Style (17th ed.) Citation

Sabin, Edwin L. Boys' Book of Frontier Fighters. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Sabin, Edwin L. Boys' Book of Frontier Fighters. Project Gutenberg, 2010.

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