Welch, Patrick J. <br/><br/>
Economics :  theory and practice /​ 
Patrick J. Welch, Gerry F. Welch. 
 - 7th ed. 
 - Hoboken, NJ :  John Wiley,  2004. 
 - xiv, 544 p. :  ill. ;  25 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0470000287 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economics.