Paul Roberts. (1956). Patterns of English. New York: Harcourt, Brace and World.
Dyfyniad Arddull ChicagoPaul Roberts. Patterns of English. New York: Harcourt, Brace and World, 1956.
Dyfyniad MLAPaul Roberts. Patterns of English. New York: Harcourt, Brace and World, 1956.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.