Guidelines :  development of national parks and protected areas for tourism / 
World Tourism Organization and United Nations Environment Programme 
 - Madrid :  WTO,  1992 
 - 53 p. :  ill. ;  30 cm. 
<br/><br/>Bibliography: p. 51-53 
<br/><br/><label>ISBN: </label>9284400260 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Tourist trade<br/>Tourism<br/>Travel
<br/><br/><label>Dewey Class. No.: </label>910.202