Kothari, C.R. <br/><br/>
Research Methodology 
Methods & Techniques 
 - New Delhi  Wishwa Prakashan  1985 
 - 468 
<br/><br/><label>ISBN: </label>8173280363 
<br/><br/><label>Publisher. No.: </label> Gangaram Book Bureau 
<br/><br/><label>Subjects--Personal Names: </label> Environmental Science 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental Science