Ecotourism/ 
Fennell, David A. 
 - 3rd ed. 
 - London:  Routledge,  2008. 
 - 282 p. 
<br/><br/><label>ISBN: </label>9780415429313 
<br/><br/><label>Dewey Class. No.: </label>338.4791  / FEN/E