Lua APA (7ú heag.)

LANGAN, J. (1977). English skills. McGraw-Hill.

Lua i Stíl Chicago (17ú heag.)

LANGAN, John. English Skills. New York: McGraw-Hill, 1977.

Lua MLA (9ú heag.)

LANGAN, John. English Skills. McGraw-Hill, 1977.

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