1. Guidelines for ecotourists;Ecotourism Association of Australia,1993
2. The Ecotourism Society Document;Ecotourism Society,1992
3. Tourism and conservation: conflict, coexistence or symbiosis;Budowski;Environmental Conservation,1976
4. National Ecotourism Strategy;Commonwealth Department of Tourism,1994
5. Ecotourism and Nature Based Holidays;Richardson,1993