Copi, I. M., & Cohen, C. (2019). Introduction to Logic (15th.). Routledge.
芝加哥风格引文Copi, Irving M., 与 Carl Cohen. Introduction to Logic. 15th. New York: Routledge, 2019.
MLA引文Copi, Irving M., 与 Carl Cohen. Introduction to Logic. 15th. Routledge, 2019.
警告：这些引文格式不一定是100％准确.