Crystal, D. (1991). Cambridge encyclopedia. Cambridge University Press.
Chicago Edition CitationCrystal, David. Cambridge Encyclopedia. New York: Cambridge University Press, 1991.
Deismireacht MLACrystal, David. Cambridge Encyclopedia. Cambridge University Press, 1991.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.