O'Sullivan, Michael. <br/><br/>
Competitive edge through credit management / 
Michael O'Sullivan. 
 - 4th ed. 
 - [S.l.] :  Addison Wesley,  1992. 
 - 224 p. 
<br/><br/><label>ISBN: </label>0201568810 (paperback) 9780201568813 (paperback)