Understanding economics. / 
Russell S. Sobel, Richard L. Stroup, David A. Macpherson, James D. Gwartney. 
 - 1st ed. 
 - Australia :  Thomson,  2006. 
 - xxvi,656 p. 
<br/><br/><label>ISBN: </label>0324315635 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economics.