Crystal, D. (2002). Language death (Canto ed.). Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Crystal, David. Language Death. Canto ed. Cambridge, UK ; New York, NY: Cambridge University Press, 2002.
Lua MLA (9ú heag.)Crystal, David. Language Death. Canto ed. Cambridge University Press, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.