Não informado. (1948). Language Learning. Research Club in Language Learning.
Lua i Stíl Chicago (17ú heag.)Não informado. Language Learning. Ann Arbor, Mich: Research Club in Language Learning, 1948.
Lua MLA (8ú heag.)Não informado. Language Learning. Research Club in Language Learning, 1948.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.