APA (7th ed.) Citation

Shepard, S. (2011). Ruthless: A pretty little liars novel. HarperTeen.

Chicago Style (17th ed.) Citation

Shepard, Sara. Ruthless: A Pretty Little Liars Novel. New York: HarperTeen, 2011.

MLA (9th ed.) Citation

Shepard, Sara. Ruthless: A Pretty Little Liars Novel. HarperTeen, 2011.

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