APA (7th ed.) Citation

Gaarder, J., & Møller, P. (2007). Sophie's world: A novel about the history of philosophy (Pbk. ed.). Farrar, Straus, Giroux.

Chicago Style (17th ed.) Citation

Gaarder, Jostein, and Paulette Møller. Sophie's World: A Novel About the History of Philosophy. Pbk. ed. New York: Farrar, Straus, Giroux, 2007.

MLA (8th ed.) Citation

Gaarder, Jostein, and Paulette Møller. Sophie's World: A Novel About the History of Philosophy. Pbk. ed. Farrar, Straus, Giroux, 2007.

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