O'Sullivan, Arthur. <br/><br/>
Economics :  principles and tools / 
Arthur O'Sullivan [and] Steven M. Sheffrin. 
 - 4th ed. 
 - Upper Saddle River :  Pearson,  2006. 
 - xxxii, 814 p. :  col. ill. ;  25 cm. 
<br/><br/> Includes index. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0131968723 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economics.