Cita APA (7a ed.)
Gaarder, J., & Moller, P. (1995). Sophie's world: A novel about the history of philosophy. Phoenix.
Cita Chicago Style (17a ed.)
Gaarder, Jostein, y Paulette Moller. Sophie's World: A Novel About the History of Philosophy. London: Phoenix, 1995.
Cita MLA (9a ed.)
Gaarder, Jostein, y Paulette Moller. Sophie's World: A Novel About the History of Philosophy. Phoenix, 1995.
Precaución: Estas citas no son 100% exactas.