Ray, G.L.   <br/><br/>
Research method in social science and extention education 
by G.L.  Ray 
 - Calcutta   Naya prakash India     1999 
 - 326p. 
<br/><br/><label>Source: </label>Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/> S  Mondal