APA (7th ed.) Citation

Cromie, R. (2008). The Crack of Doom. Project Gutenberg.

Chicago Style (17th ed.) Citation

Cromie, Robert. The Crack of Doom. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Cromie, Robert. The Crack of Doom. Project Gutenberg, 2008.

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