"Gans, Joshua." <br/><br/>
Principles of economics / 
Gans Joshua. 
 - 3rd ed. 
 - Melbourne :  "Thomson,"  2005. 
 - 831 p. : 
<br/><br/><label>ISBN: </label>017012147X 
<br/><br/><label>LC Class. No.: </label>HB 171.5  / .G36 2005