Cita APA (7a ed.)

Gaarder, J. 1. a. (1997). Sophie's world: A novel about the history of philosophy ([14th. ed.].). Phoenix.

Cita Chicago Style (17a ed.)

Gaarder, Jostein 1952- aut. Sophie's World: A Novel About the History of Philosophy. [14th. ed.]. London: Phoenix, 1997.

Cita MLA (9a ed.)

Gaarder, Jostein 1952- aut. Sophie's World: A Novel About the History of Philosophy. [14th. ed.]. Phoenix, 1997.