Aitchison, J. (2001). Language change: Progress or decay? (3rd ed.). Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Aitchison, Jean. Language Change: Progress or Decay? 3rd ed. Cambridge [England] ; New York: Cambridge University Press, 2001.
Lua MLA (8ú heag.)Aitchison, Jean. Language Change: Progress or Decay? 3rd ed. Cambridge University Press, 2001.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.