Gilbert, J. B., & Judy B. Gilbert. (1993). Clear speech: Pronunciation and Listening Comprehension in North American English : student's book. Cambridge: Cambridge University Press.
Trích dẫn kiểu ChicagoGilbert, Judy B., và Judy B. Gilbert. Clear Speech: Pronunciation and Listening Comprehension in North American English : Student's Book. Cambridge: Cambridge University Press, 1993.
Deismireacht MLAGilbert, Judy B., và Judy B. Gilbert. Clear Speech: Pronunciation and Listening Comprehension in North American English : Student's Book. Cambridge: Cambridge University Press, 1993.
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