APA (7th ed.) Citation

Ahern, C. (2007). P.S I love you. HarperCollinsPublishers.

Chicago Style (17th ed.) Citation

Ahern, Cecelia. P.S I Love You. London: HarperCollinsPublishers, 2007.

MLA (9th ed.) Citation

Ahern, Cecelia. P.S I Love You. HarperCollinsPublishers, 2007.

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