Copi, I. M., & Cohen, C. (2005). Logic: Language, deduction and induction (12th ed.). Pearson Education, Inc.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCopi, Irving M., और Carl Cohen. Logic: Language, Deduction and Induction. 12th ed. Jurong, Singapore: Pearson Education, Inc, 2005.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCopi, Irving M., और Carl Cohen. Logic: Language, Deduction and Induction. 12th ed. Pearson Education, Inc, 2005.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.