APA (7th ed.) Citation

Verne, J. (2010). Twenty thousand leagues under the sea. Project Gutenberg.

Chicago Style (17th ed.) Citation

Verne, Jules. Twenty Thousand Leagues Under the Sea. To be supplied: Project Gutenberg, 2010.

MLA (8th ed.) Citation

Verne, Jules. Twenty Thousand Leagues Under the Sea. Project Gutenberg, 2010.

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