Copi, I. M. (1986). Introduction to logic (7th ed.). Macmillan ; Collier Macmillan.
Lua i Stíl Chicago (17ú heag.)Copi, Irving M. Introduction to Logic. 7th ed. New York : London: Macmillan ; Collier Macmillan, 1986.
Lua MLA (8ú heag.)Copi, Irving M. Introduction to Logic. 7th ed. Macmillan ; Collier Macmillan, 1986.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.