Lipsey, Richard G. <br/><br/>
An introduction to positive economics / 
Richard G. Lipsey. 
 - 7th. ed. 
 - London :  Weidenfeld and Nicolson,  1989. 
 - 808 p. :  ill. ;  25 cm. 
<br/><br/> Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>0297795554 0194424529 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Economics--Study and teaching.