O'Brien, James A., Introduction to information systems : Essentials for the internetworked enterprise / James A. O'Brien. - United States of America : McGraw-Hill Companies, Inc., 2000. - xxiv, 510 pages : colored illustrations, figures ; 26 cm. Includes bibliographical references and index. ISBN: 9780072297492 Dewey Class. No.: 658.4038 / O6