APA (7th ed.) Citation

Optic, O. (2006). Within The Enemy's Lines. Project Gutenberg.

Chicago Style (17th ed.) Citation

Optic, Oliver. Within The Enemy's Lines. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Optic, Oliver. Within The Enemy's Lines. Project Gutenberg, 2006.

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