Citazione Stile APA (7a Edizione)

Gaarder, J., & Moller, P. (1996). Sophie's world: A novel about the history of philosophy. Phoenix.

Citazione stile Chigago Style (17a edizione)

Gaarder, Jostein, e Paulette Moller. Sophie's World: A Novel About the History of Philosophy. London: Phoenix, 1996.

Citatione MLA (9a ed.)

Gaarder, Jostein, e Paulette Moller. Sophie's World: A Novel About the History of Philosophy. Phoenix, 1996.