Kumar , Krishan  <br/><br/>
Theory of classification : 

 - Vikas :  Delhi ;  1979. 
 - 560 p ;21 cm .  01 
 - 2024-09-18 
<br/><br/><label>Nat. Bib. No.: </label>0010623 
<br/><br/><label>Nat. Bib. Agency Control No.: </label>KUM 
<br/><br/><label>Universal Decimal Class. No.: </label>720