International trade : theory and policy 
Paul R. Krugman. 
 - 12th ed. 
 -  Pearson Education Limited.  2023 
<br/><br/>
<br/><br/><label>ISBN: </label>978-1-29241723-3 
<br/><br/><label>Dewey Class. No.: </label>382 K943 2023