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.
Precaución: Estas citas no son 100% exactas.