Holtz, Herman.  <br/><br/>
How to succeed as an independent consultant / 
Herman Holtz and David Zahn. 
 - fourth edition 
 - Hoboken, N.J. :  John Wilet and Sons,  c2004 
 - 414 p. 
<br/><br/><label>ISBN: </label>0471469106 9780471469100 
<br/><br/><label>Dewey Class. No.: </label>658.46