Dixson, R. J. (1980). Modern American english (New ed.). New York: Regents Publishing company, Inc.
Dyfyniad Arddull ChicagoDixson, Robert J. Modern American English. New ed. New York: Regents Publishing company, Inc, 1980.
Dyfyniad MLADixson, Robert J. Modern American English. New ed. New York: Regents Publishing company, Inc, 1980.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.