Tough, Joan. The development of meaning : a study of children's use of languag e / Joan Tough. - London : George Allen & Unwin , 1977. - x, 198 p. : ill. ; 23 cm. Includes bibliographical references (p. 193-195). ISBN: 004372020x Subjects--Topical Terms: Children--Language. Dewey Class. No.: 401.9