Lua APA (7ú heag.)

Langan, J. (2002). English skills with readings (5th ed.). McGraw-Hill.

Lua i Stíl Chicago (17ú heag.)

Langan, John. English Skills with Readings. 5th ed. Boston: McGraw-Hill, 2002.

Lua MLA (8ú heag.)

Langan, John. English Skills with Readings. 5th ed. McGraw-Hill, 2002.

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.