8David HL Thomas, Fethi Ayacha and G Edard Hollis. Use and non - use values in the conservation of Ichkeul National Park [ J ]. Environment Conservation, 1991,18 ( 2 ) : 119 -3 130.
9Jiangying xu, Liding chen. Local people's perceptions as decision support for protected area management in Wolong Biosphere Reserve, China [ J ] . Journal of Environmental Management ,2006,78:362 - 372.