O'Brien, James A., 1936- Introduction to information systems/ essentials for the internetworked enterprice/ James A. O'Brien. - 9th ed. - Burr Ridge, Ill. : Irwin, c2000. - xxiv, 510, 19, 8 p. : col. ill. ; 27 cm. Includes bibliographical references and indexes. ISBN: 0071169733 (pbk) 0072297492 Subjects--Topical Terms: Business--Data processing.Management--Data processing. LC Class. No.: HF5548.2 OBR