| 期刊論文| 1. | Baez, A.、Rovinski, Y.(1992)。Ecotourism in Costa Rica: The tough road for remaining number one。Adventure Travel Society Newsletter，1，6。   | | 2. | Hoon, Yeoh Siew(199204)。Ecotourism-What? How? Why?。PATA Travel News。 | 圖書| 1. | The Ecotourism News-letter(1992)。The Ecotourism Society。 | | 2. | Ziffer, Karen A.(1989)。Ecotourism: The Uneasy Alliance。Conservation International Ernst & Young。 | | 3. | Boo, Elizabeth(1991)。Ecotourism: The Potentials and Pitfalls。Washington, D.C.：World Wildlife Fund。 | 其他| 1. | The Environmental for Tourism(1991)。The National Anduban Society。 | |