Sinnott-Armstrong, W., & Fogelin, R. J. (2010). Understanding arguments: An introduction to informal logic (8th ed.). Wadsworth, Cengage Learning.
Lua i Stíl Chicago (17ú heag.)Sinnott-Armstrong, Walter, agus Robert J. Fogelin. Understanding Arguments: An Introduction to Informal Logic. 8th ed. Australia: Wadsworth, Cengage Learning, 2010.
Lua MLA (9ú heag.)Sinnott-Armstrong, Walter, agus Robert J. Fogelin. Understanding Arguments: An Introduction to Informal Logic. 8th ed. Wadsworth, Cengage Learning, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.