APA (7th ed.) Citation

Verne, J.. (1994). Twenty thousand leagues under the sea. Penguin Books.

Chicago Style (17th ed.) Citation

Verne, Jules. Twenty Thousand Leagues Under the Sea. London: Penguin Books, 1994.

MLA (9th ed.) Citation

Verne, Jules. Twenty Thousand Leagues Under the Sea. Penguin Books, 1994.