Sayward, C. (2009). Dialogues concerning natural numbers. Peter Lang.
芝加哥风格引文Sayward, Charles. Dialogues Concerning Natural Numbers. New York: Peter Lang, 2009.
MLA引文Sayward, Charles. Dialogues Concerning Natural Numbers. Peter Lang, 2009.
警告：这些引文格式不一定是100％准确.