APA (7th ed.) Zitazioa
Gaarder, J., & Moller, P. (1995). Sophie's world: A novel about the history of philosophy. Phoenix.
Chicago Style (17th ed.) Zitazioa
Gaarder, Jostein, eta Paulette Moller. Sophie's World: A Novel About the History of Philosophy. London: Phoenix, 1995.
MLA (9th ed.) Zitazioa
Gaarder, Jostein, eta Paulette Moller. Sophie's World: A Novel About the History of Philosophy. Phoenix, 1995.
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