5Orams M B. Types of Ecotourism, in Encyclopedia of Ecotourism(edited by David B. Weaver)[C]. CABI Publishing,2001.24.
6世界旅游组织.旅游业可持续发展——地方旅游规划指南[M].北京:中国旅游出版社,1993.
7Elizabeth Boo. Ecotourism: The Potentiais and Pitfails[ M ]. WWF ,1990.
8The Ecotourism Society Newsletter 1, No. l(Spring 1991):1 cited in Catrina Brandon, Ecotourism and Conservation: A Review of Key Issue, Envirnment Department Papers[R]. Biodiversity Series, No.033(Washington D.C. :World Bank,Apirl 1996).
9Kutay K. Ecotourism and Adventure Travel. In Tourism and Ecology:The Impact of Travel on a Fragile Earth[ J]. North Ameirican Coordinating Center for Responsible Travel, 1989:3 - 7.