APA (7th ed.) Citation

Ahern, C. (2011). P.S. I love you. HarperCollins Publisher.

Chicago Style (17th ed.) Citation

Ahern, Cecelia. P.S. I Love You. London: HarperCollins Publisher, 2011.

MLA (9th ed.) Citation

Ahern, Cecelia. P.S. I Love You. HarperCollins Publisher, 2011.

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