Harold B. Allen. (1965). Teaching English as a second language. New York: McGraw-Hill.
Trích dẫn kiểu ChicagoHarold B. Allen. Teaching English As a Second Language. New York: McGraw-Hill, 1965.
Deismireacht MLAHarold B. Allen. Teaching English As a Second Language. New York: McGraw-Hill, 1965.
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