Apirat Iamsiri. 1999. Environmental risk assessment of planned ecotourism in Sunpundan wildlife sanctuary Mae Hong Son province. Field of Study Environmental Science, Chiang Mai University;
Apirat Iamsiri. (1999) Environmental risk assessment of planned ecotourism in Sunpundan wildlife sanctuary Mae Hong Son province . Chiang Mai University/Chiang Mai.
Apirat Iamsiri. Environmental risk assessment of planned ecotourism in Sunpundan wildlife sanctuary Mae Hong Son province. . Chiang Mai:Chiang Mai University, 1999.
Apirat Iamsiri. (1999) Environmental risk assessment of planned ecotourism in Sunpundan wildlife sanctuary Mae Hong Son province . Chiang Mai University/Chiang Mai.