Termsin Manawanich. 2004. The formulation of training curriculum for tourist guides on ecotourism. Field of Study Environmental Education, Mahidol University;
Termsin Manawanich. (2004) The formulation of training curriculum for tourist guides on ecotourism . Mahidol University/Bangkok.
Termsin Manawanich. The formulation of training curriculum for tourist guides on ecotourism. . Bangkok:Mahidol University, 2004.
Termsin Manawanich. (2004) The formulation of training curriculum for tourist guides on ecotourism . Mahidol University/Bangkok.