ABRAMS, BILL. <br/><br/>
THE OBSERVATIONAL REARCH HAND BOOK. 

 - UUNITED STATE;  NTC BUSINESS BOOKS,  2000. 
<br/><br/><label>ISBN: </label>065800073-X 
<br/><br/><label>Dewey Class. No.: </label>658. 834`21 ABR