Fergus, P. M. Spelling improvement - 5th ed. - Singapore Learners Pub 1991 - 248 p. 23 cm. 002349 C 007 ISBN: 0071127577 Subjects--Topical Terms: English languageSpelling abilitySpelling ability--Computer-assisted instruction--Programmed instruction Dewey Class. No.: 428.1 / S743