International travel--international trade, 
by H. Peter Gray.  
 - Lexington,  Heath Lexington Books  [1970]  
 - xiii, 264 p  23 cm. 
<br/><br/>Includes bibliographical references.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Balance of payments.<br/>Tourism.
<br/><br/><label>LC Class. No.: </label>G155.A1  / G7