Valacich, Joseph S. Essentials of systems analysis and design / Joseph S. Valacich, Joey F. George, Jeffrey A. Hoffer. - 4th ed. - Upper Saddle River, N.J. : Pearson Education International, c2009. - 459 p. : ill. ; 28 cm. Includes bibliographical references and index. ISBN: 9780135069844 Subjects--Topical Terms: System design.System analysis. Dewey Class. No.: 004.21 V J E 221