Tongmee, . J. .; Woramethisrisakul, U. .; Mahahing, S. . THE MANAGEMENT OF PARTICIPATORY LEARNING ACTIVITY BASED ON THE THREEFOLD TRAINING BY ADOPTING THE PHILOSOPHY OF SUFFICIENCY ECONOMY TO PROMOTE SUSTAINABLE EDUCATIONAL MANAGEMENT IN SCHOOLS UNDER NONG SAMRONG MUNICIPALITY, UDON THANI PROVINCE. JBER 2020, 5, 173-187.