APA (7th ed.) Citation

Gavalda, A., & Evans, C. (2005). Someone I loved. Riverhead Books.

Chicago Style (17th ed.) Citation

Gavalda, Anna, and Catherine Evans. Someone I Loved. New York: Riverhead Books, 2005.

MLA (9th ed.) Citation

Gavalda, Anna, and Catherine Evans. Someone I Loved. Riverhead Books, 2005.