The principles of business computing / 
by P. M. Q. Lay ... [et al.] 
 - 3rd ed. 
 - Kenwyn :  Juta,  1988. 
 - viii, 370 p. :  ill. ;  25cm. 
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>070212141X (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Business --data processing.