Gaarder, J. (1994). Sophie's world: A novel about the history of philosophy. Phoenix.
芝加哥风格引文Gaarder, Jostein. Sophie's World: A Novel About the History of Philosophy. Great Britain: Phoenix, 1994.
MLA引文Gaarder, Jostein. Sophie's World: A Novel About the History of Philosophy. Phoenix, 1994.
警告：这些引文格式不一定是100％准确.