Neuman, W. Lawrence  <br/><br/>
Social research methods:  quantitative and qualitative approaches, 

 - 6th ed. 
 - New Delhi :  Dorling Kindersley Pvt. Ltd.  
 - 592 p. 
<br/><br/><label>ISBN: </label>9788131714645 
<br/><br/><label>Dewey Class. No.: </label>001.42  / NEU