Paul Roberts. (1964). English syntax: A book of programmed lessons. New York: Harcourt, Brace and World.
Dyfyniad Arddull ChicagoPaul Roberts. English Syntax: A Book of Programmed Lessons. New York: Harcourt, Brace and World, 1964.
Dyfyniad MLAPaul Roberts. English Syntax: A Book of Programmed Lessons. New York: Harcourt, Brace and World, 1964.
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