Hawkins, Clifford Sorgi, Marco <br/><br/>
Research : How to Plan, Speak and Write about it 

 - New Delhi  Narosa Publishing House  1990 
 - p.184 
<br/><br/><label>ISBN: </label>8185198055 
<br/><br/><label>Dewey Class. No.: </label>001.4 H43R