APA (7th ed.) Citation

Vincent, H. (2009). The Copper-Clad World. Project Gutenberg.

Chicago Style (17th ed.) Citation

Vincent, Harl. The Copper-Clad World. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Vincent, Harl. The Copper-Clad World. Project Gutenberg, 2009.

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