Trask, R. L. (1994). Language change. Routledge.
Lua i Stíl Chicago (17ú heag.)Trask, R. L. Language Change. London: Routledge, 1994.
Lua MLA (9ú heag.)Trask, R. L. Language Change. Routledge, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.