O'Leary, T. J. <br/><br/>
Computers and information systems / 
T. J. O'Leary, B. K. Williams. 
 - 2nd ed. 
 - Redwood City, CA :  Benjamin/Cummings,  1989. 
 - xxix, 687 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0-8053-6942-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electronic data processing<br/>Information storage and retrieval systems<br/>Business<br/>Computers