APA (7th ed.) Citation

Chesterton, G. K. (2004). The Ball and the Cross. Project Gutenberg.

Chicago Style (17th ed.) Citation

Chesterton, G. K. The Ball and the Cross. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Chesterton, G. K. The Ball and the Cross. Project Gutenberg, 2004.

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