APA (7th ed.) Citation

Ballantyne, R. M. (2007). The Ocean and its Wonders. Project Gutenberg.

Chicago Style (17th ed.) Citation

Ballantyne, R. M. The Ocean and Its Wonders. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Ballantyne, R. M. The Ocean and Its Wonders. Project Gutenberg, 2007.

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