Economics : principles, problems, and policies 
McConnell, Campbell R. 
 - Seventeenth edition. 
 -  McGraw-Hill  Companies, Inc.  2008 
 - xxviii,716 pages. 
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<br/><br/><label>ISBN: </label>978-0-07-126594-2 
<br/><br/><label>Dewey Class. No.: </label>330 M13e 2008