Crystal, D. (2001). Cambride encyclopedia of the English language (Reprinted.). Cambridge: Cambridge University Press.
Dyfyniad Arddull ChicagoCrystal, David. Cambride Encyclopedia of the English Language. Reprinted. Cambridge: Cambridge University Press, 2001.
Dyfyniad MLACrystal, David. Cambride Encyclopedia of the English Language. Reprinted. Cambridge: Cambridge University Press, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.