Copi, I. M., & Rodych, V. C. (2019). Introduction to logic (15th ed.). Routledge.
Lua i Stíl Chicago (17ú heag.)Copi, Irving M., agus Victor Cohen Rodych. Introduction to Logic. 15th ed. New York: Routledge, 2019.
Lua MLA (9ú heag.)Copi, Irving M., agus Victor Cohen Rodych. Introduction to Logic. 15th ed. Routledge, 2019.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.