Singh, Y.P.. <br/><br/>
Encyclopaedic Dictionary of Commerce Vol-4 /  

 - First Ed.. /  
 - New Delhi-51 :   Akashdeep Publishing House. 
 - p.305 :  
<br/><br/><label>ISBN: </label>81-7158-168-4 
<br/><br/><label>Dewey Class. No.: </label>X:8k  / N0.4