APA (7th ed.) Citation

Verne, J. (2010). A journey to the centre of the earth. Project Gutenberg.

Chicago Style (17th ed.) Citation

Verne, Jules. A Journey to the Centre of the Earth. To be supplied: Project Gutenberg, 2010.

MLA (8th ed.) Citation

Verne, Jules. A Journey to the Centre of the Earth. Project Gutenberg, 2010.

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