Sustainable tourism : a geographical perspective / 
edited by C. Michael Hall and Alan A. Lew 
 - Essex :  Longman,  1998 
 - xii, 236 p. :  ill. ;  24 cm. 
<br/><br/>References : p. 204-227 
<br/><br/><label>ISBN: </label>0582322626  RM112.52 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ecotourism