Singh, shivprasas <br/><br/>
Adhunik parivesh aur astitvavad 

 - New Delhi  National publishing house  1998 
 - 147p. 
<br/><br/><label>ISBN: </label>81-214-0183-6 
<br/><br/><label>Dewey Class. No.: </label>H111.1    Sin. M8