Haag, Stephen. Information systems essentials / Stephen Haag, Maeve Cummings. - 2nd ed. - Boston : McGraw-Hill/Irwin, 2008. - xxxi, 490 p. : ill. (some col ; 28 cm. + 1 CD-ROM (4 3/4 in.) Includes bibliographical references and index. ISBN: 9780073511528 (alk. paper) 0073511528 (alk. paper) LCCN: 2006027122 Subjects--Topical Terms: Management information systems.Information technology. LC Class. No.: T58.6 / .H17 2008b Dewey Class. No.: 658.4/038/011