Libbish, B. e. (1964). Advances in the teaching of modern languages. Pergamon Press.
Lua i Stíl Chicago (17ú heag.)Libbish, B. ed. Advances in the Teaching of Modern Languages. Oxford: Pergamon Press, 1964.
Lua MLA (9ú heag.)Libbish, B. ed. Advances in the Teaching of Modern Languages. Pergamon Press, 1964.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.