Strogatz, S. H., & Joffray, D. (2009). The calculus of friendship: What a teacher and a student learned about life while corresponding about math. Princeton University Press.
芝加哥风格引文Strogatz, Steven H., 与 Don Joffray. The Calculus of Friendship: What a Teacher and a Student Learned About Life While Corresponding About Math. Princeton: Princeton University Press, 2009.
MLA引文Strogatz, Steven H., 与 Don Joffray. The Calculus of Friendship: What a Teacher and a Student Learned About Life While Corresponding About Math. Princeton University Press, 2009.
警告：这些引文格式不一定是100％准确.