United Nations. Statistical Office and Others <br/><br/>
System of international comparisons of gross product and purchasing power   
By Irving B. Kravis, Zoltan Kenessey, Alan Heston and Robert Summers. 
 - Baltimore  Johns Hopkins University Press  1975 
 - xi, 294p. 
<br/><br/>  
<br/><br/><label>Dewey Class. No.: </label>339.31  / Un58.SI