Fogelin, R. J. (2005). Understanding arguments: An introduction to informal logic (7th ed.). Thomson Wadsworth.
Lua i Stíl Chicago (17ú heag.)Fogelin, Robert J. Understanding Arguments: An Introduction to Informal Logic. 7th ed. Belmont, Calif: Thomson Wadsworth, 2005.
Lua MLA (9ú heag.)Fogelin, Robert J. Understanding Arguments: An Introduction to Informal Logic. 7th ed. Thomson Wadsworth, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.