TRASK, R. (1996). Language change. Routledge.
Lua i Stíl Chicago (17ú heag.)TRASK, R.L. Language Change. London: Routledge, 1996.
Lua MLA (9ú heag.)TRASK, R.L. Language Change. Routledge, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.