Gaarder, J. (1996). Sophie's world: A novel about the history of philosophy. Penguin Group.
シカゴスタイル引用形Gaarder, Jostein. Sophie's World: A Novel About the History of Philosophy. New York: Penguin Group, 1996.
MLA引用形式Gaarder, Jostein. Sophie's World: A Novel About the History of Philosophy. Penguin Group, 1996.
警告: この引用は必ずしも正確ではありません.