Bumroong-Ayosakoon, T.; Kosito, P.; Somkhaoyai, T.; Chonrat, V. GUIDELINES FOR INTERNAL EDUCATIONAL QUALITY ASSURANCE ACCORDING TO THE 4 IDDHIPADAS PRINCIPLE OF PRIVATE SCHOOLS FOR ORDINARY EDUCATION IN NAKHON SI THAMMARAT PROVINCE. jg-mcukk 2021, 8, 187-199.