Underhill, Adrian. Sound foundations : learning and teaching pronunciation / Adrian Underhill. - London : Macmillan, c1994 [2005]. - xi, 210 p. : 25 cm. - Macmillan books for teachers . ISBN: 978 1 4050 6408 8 Subjects--Topical Terms: English Language--Formal Approach Dewey Class. No.: 428.13 / UNS