APA (7th ed.) Citation

Verne, J. (2006). A Journey to the Center of the Earth. Project Gutenberg.

Chicago Style (17th ed.) Citation

Verne, Jules. A Journey to the Center of the Earth. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Verne, Jules. A Journey to the Center of the Earth. Project Gutenberg, 2006.

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