APA (7th ed.) Citation

Haggard, H. R. (2007). Heart of the World. Project Gutenberg.

Chicago Style (17th ed.) Citation

Haggard, H. Rider. Heart of the World. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Haggard, H. Rider. Heart of the World. Project Gutenberg, 2007.

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