Copi , I. M. (1976). Symbolic Logic (5th.). Pearson.
Lua i Stíl Chicago (17ú heag.)Copi , Irving M. Symbolic Logic. 5th. Delhi: Pearson, 1976.
Lua MLA (9ú heag.)Copi , Irving M. Symbolic Logic. 5th. Pearson, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.