Poontep, W. .; Thipkrd, P. .; Damrongwattana, J. .; Jamnongtham, M. . GROUP MANAGEMENT UNDER THE PHILOSOPHY OF SUFFICIENCY ECONOMY: A CASE STUDY WITHIN KHAN OIL GROUP OF PISON THAI HERB, PAK NAKHON SUB - DISTRICT, MUEANG DISTRICT, NAKHON SI THAMMARAT PROVINCE. JISSD 2024, 1, 1-8.