Cark , G. H. (1985). Logic (2nd ed.). The Trinity Foundation.
Lua i Stíl Chicago (17ú heag.)Cark , Gordon H. Logic. 2nd ed. Maryland: The Trinity Foundation, 1985.
Lua MLA (9ú heag.)Cark , Gordon H. Logic. 2nd ed. The Trinity Foundation, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.