Natipong Butrrat. 2009. An operational study in health promotion tourism resources at Muang district, Chiangrai province. Faculty of Environment and Resource Studies, Mahidol University;
Natipong Butrrat. (2009) An operational study in health promotion tourism resources at Muang district, Chiangrai province . Mahidol University/Bangkok.
Natipong Butrrat. An operational study in health promotion tourism resources at Muang district, Chiangrai province. . Bangkok:Mahidol University, 2009.
Natipong Butrrat. (2009) An operational study in health promotion tourism resources at Muang district, Chiangrai province . Mahidol University/Bangkok.