Copi, I. M., & Cohen, C. (2005). Logic: Language, deduction and induction (12th ed.). Pearson Education, Inc.
Lua i Stíl Chicago (17ú heag.)Copi, Irving M., agus Carl Cohen. Logic: Language, Deduction and Induction. 12th ed. Jurong, Singapore: Pearson Education, Inc, 2005.
Lua MLA (9ú heag.)Copi, Irving M., agus Carl Cohen. Logic: Language, Deduction and Induction. 12th ed. Pearson Education, Inc, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.