Langan, J. (2014). College writing skills with readings 9th ed. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Langan, John. College Writing Skills with Readings 9th Ed. McGraw-Hill, 2014.
Lua MLA (8ú heag.)Langan, John. College Writing Skills with Readings 9th Ed. McGraw-Hill, 2014.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.