APA (7th ed.) Citation

Ballantyne, R. M. (2007). Twice Bought. Project Gutenberg.

Chicago Style (17th ed.) Citation

Ballantyne, R. M. Twice Bought. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Ballantyne, R. M. Twice Bought. Project Gutenberg, 2007.

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