Black, J. A. <br/><br/>
Methods and issues in social research 

 - New York  John Wiley & Sons  1976 
 - 445p. 
<br/><br/><label>ISBN: </label> USD 6.65 
<br/><br/><label>Source: </label> USD 6.65 
<br/><br/><label>Dewey Class. No.: </label>300.72 BLA