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By Heward, William L.,. Columbus : Merrill Pub. Co., 1988 . xiii, 657 p. : , Includes indexes. 24 cm.. 0675208904

By HEWARD, William . L .. Columbus : Merrill Publishing Company , 1988 . xiii , 657 p . : , Includes references and index . 9780675208901 .

By HEWARD, William L.. New Jersey; Pearson Education Inc., 2000 . xxii, 632 p. , Includes Glossary, References and Index. 9780130129383