Lehman, John A. Systems design in the fourth generation : object-based development using dBASE / John A. Lehman. - New York : Wiley, c1991. - x, 381 p. : ill. ; 24 cm. - Wiley series in computing and information processing . Includes bibliographical references and index. ISBN: 0471527521 TZS 5267.5 Subjects--Topical Terms: System design. Dewey Class. No.: 005.7565 LEH