A System of international comparisons of gross product and purchasing power / 
produced by the Statistical Office of the United Nations, the World Bank, and the International Comparison Unit of the University of Pennsylvania ; I.B. Kravis ... [et al.]. 
 - Baltimore :  Published for World Bank by Johns Hopkins University Press,  1975. 
 - xi, 294 p.  ill. ;  28 cm. 
<br/><br/> At head of title: United Nations International Comparison Project: phase one 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0801816068 0801816696 (pbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Income<br/>Gross national product<br/>Purchasing power