APA (7th ed.) Citation

Gaarder, J. (1994). Sophie's world. Phoenix.

Chicago Style (17th ed.) Citation

Gaarder, Jostein. Sophie's World. London: Phoenix, 1994.

MLA (8th ed.) Citation

Gaarder, Jostein. Sophie's World. Phoenix, 1994.

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