Black James A. <br/><br/>
Methods and Issues in Social Research 

 - London  John Willey & Sons UK        1976 
 - 445p.  cm. 
<br/><br/> Appendix:p 235-58 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>Yb4, L6/TD