Copi, I. M. (1979). Symbolic logic (5th ed.). Macmillan ; Prentice Hall of India.
Lua i Stíl Chicago (17ú heag.)Copi, Irving M. Symbolic Logic. 5th ed. New York : New Delhi: Macmillan ; Prentice Hall of India, 1979.
Lua MLA (8ú heag.)Copi, Irving M. Symbolic Logic. 5th ed. Macmillan ; Prentice Hall of India, 1979.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.