Clayton, Gary E. <br/><br/>
Economics : principles and practices 

 - Columbus, Ohio  Glencoe/McGraw-Hill  2003 
 - 565 p 
<br/><br/><label>ISBN: </label>0- 07- 828562- 3 
<br/><br/><label>LC Class. No.: </label>HB 171 .C57/