Langan, J. (2009). Sentence skills: A workbook for writers : form B (8th ed.). McGraw-Hill Higher Education.
Lua i Stíl Chicago (17ú heag.)Langan, John. Sentence Skills: A Workbook for Writers : Form B. 8th ed. Boston: McGraw-Hill Higher Education, 2009.
Lua MLA (9ú heag.)Langan, John. Sentence Skills: A Workbook for Writers : Form B. 8th ed. McGraw-Hill Higher Education, 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.