APA (7th ed.) Citation

Ballantyne, R. M. (2007). The World of Ice. Project Gutenberg.

Chicago Style (17th ed.) Citation

Ballantyne, R. M. The World of Ice. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Ballantyne, R. M. The World of Ice. Project Gutenberg, 2007.

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