Não informado. (1985). Second language research. Edward Arnold.
Lua i Stíl Chicago (17ú heag.)Não informado. Second Language Research. London: Edward Arnold, 1985.
Lua MLA (8ú heag.)Não informado. Second Language Research. Edward Arnold, 1985.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.