Principles of economics 
by P.N. Chopra 
 - 6th ed. 
 - Ludhiana:  Kalyani publishers,996. 
 - xxviii, 1050p.:  ill.;  45cm. 
<br/><br/><label>ISBN: </label>81-7096-622-8 
<br/><br/><label>Subjects--Index Terms: </label>Economics Principles of economics 
<br/><br/><label>Dewey Class. No.: </label>330.01