Sorensen, Helle. <br/><br/>
International air Fares  Construction And Ticketing 
Helle Sorensen. 
 - Albany  Delmar Publishers  c1995 
 - xvii, 328 p.  ill., maps  27 cm. 
<br/><br/> Includes index.:p.325-328 
<br/><br/><label>ISBN: </label>0538710810 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Tourism