APA (7th ed.) Citation

Chesterton, G. K. (1999). The Ballad of the White Horse. Project Gutenberg.

Chicago Style (17th ed.) Citation

Chesterton, G. K. The Ballad of the White Horse. Project Gutenberg, 1999.

MLA (9th ed.) Citation

Chesterton, G. K. The Ballad of the White Horse. Project Gutenberg, 1999.

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