Não informado. (1989). Language Variation and Change. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Não informado. Language Variation and Change. Cambridge, Inglaterra: Cambridge University Press, 1989.
Lua MLA (8ú heag.)Não informado. Language Variation and Change. Cambridge University Press, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.