Judy B Gilbert. (1993). Clear speech - student's book: Pronunciation and listening comprehension in North American English. Cambridge, UK: Cambridge University Press.
Dyfyniad Arddull ChicagoJudy B Gilbert. Clear Speech - Student's Book: Pronunciation and Listening Comprehension in North American English. Cambridge, UK: Cambridge University Press, 1993.
Dyfyniad MLAJudy B Gilbert. Clear Speech - Student's Book: Pronunciation and Listening Comprehension in North American English. Cambridge, UK: Cambridge University Press, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.