Appleyard, Dennis R. <br/><br/>
International economics.  Trade theory and policy / 
 Trade theory and policy 
Dennis R. Appleyard, Alfred J. Field, Jr. 
 - 3rd ed. 
 - Boston :  Irwin/McGraw-Hill,  c1998. 
 - xxiii, 424 p. :  col. ill., map ;  26 cm.