Gilbert, Judy B. Clear speech : Pronunciation and listening comprehension in North American English : student’s book / Judy B. Gilbert. - 3rd ed. - New York : Cambridge University Press, 2008. - 174 p. : ill ; 26 cm + 1 sound disc (digital ; 4 3/4 in.) ISBN: 9780521543545 Subjects--Topical Terms: English language--Textbooks for foreign speakers