Judy B Gilbert. (1993). Clear speech - student's book: Pronunciation and listening comprehension in North American English. Cambridge, UK: Cambridge University Press.
Citación estilo ChicagoJudy B Gilbert. Clear Speech - Student's Book: Pronunciation and Listening Comprehension in North American English. Cambridge, UK: Cambridge University Press, 1993.
Cita MLAJudy B Gilbert. Clear Speech - Student's Book: Pronunciation and Listening Comprehension in North American English. Cambridge, UK: Cambridge University Press, 1993.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.