O'Brien, James A. <br/><br/>Introduction to information systems James A. O'Brien  - Eighth Edition  - Chicago:  Irwin,   1997  - various paging;  26 cm. <br/><br/><label>ISBN: </label>0256209375 <br/><br/><label>LC Class. No.: </label>HF5548.2  / O23 1997