Rao, Veluri Subba. <br/><br/>
Validity of knowledge. 

 - Delhi :  Sri Satguru Publications,  1998. 
 - xi,118 p. 
<br/><br/>Includes index references. 
<br/><br/><label>ISBN: </label>8170305780K 
<br/><br/><label>Dewey Class. No.: </label>001 RAO