Wilawon Buahoong. 2002. Evaluation of effectiveness of environmental education in certified environmental managemeng system [ISO 14001] secondary schools in Bangkok. Field of Study Environmental Education, Mahidol University;
Wilawon Buahoong. (2002) Evaluation of effectiveness of environmental education in certified environmental managemeng system [ISO 14001] secondary schools in Bangkok . Mahidol University/Bangkok.
Wilawon Buahoong. Evaluation of effectiveness of environmental education in certified environmental managemeng system [ISO 14001] secondary schools in Bangkok. . Bangkok:Mahidol University, 2002.
Wilawon Buahoong. (2002) Evaluation of effectiveness of environmental education in certified environmental managemeng system [ISO 14001] secondary schools in Bangkok . Mahidol University/Bangkok.