Gilbert, J. B. (1986). Clear Speech: Pronunciation and Listening Comprehension in American English, Student's Book. London: Cambridge University Press.
Trích dẫn kiểu ChicagoGilbert, Judy B. Clear Speech: Pronunciation and Listening Comprehension in American English, Student's Book. London: Cambridge University Press, 1986.
Deismireacht MLAGilbert, Judy B. Clear Speech: Pronunciation and Listening Comprehension in American English, Student's Book. London: Cambridge University Press, 1986.
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