Varian hel r. <br/><br/>
Intermediate microeconomics  A  modern approach 

 - New york  W.W. norton &  company  1990 
<br/><br/><label>ISBN: </label>0-393-96025-0 
<br/><br/><label>LC Class. No.: </label>338.5/VAR 
<br/><br/><label>Dewey Class. No.: </label>338.5/VAR