Motivation:   theories and principles 
/by Robert C. Beck 
 - New Jersey:  Pearson Education limited,  2004. 
 - x,470 p. :  ill. ;  23 cm. 
<br/><br/> Include bibliographical references and index. 
<br/><br/><label>ISBN: </label>013111445X 
<br/><br/><label>Dewey Class. No.: </label>658.314