Sirimethi (Hanthet), P. S. .; Phra Widedbrommakun; Phrakru Arunsutalangkarn; Wongsuwan, N. .; Khamhanphon, A. . LEARNING DEVELOPMENT BY FLIPPED CLASSROOM TECHNIQUE OF MATHAYOMSUKSA STUDENTS PETCHARIK DEMONSTRATION SCHOOL MUEANG DISTRICT NAKHON SI THAMMARAT PROVINCE. JSBA 2020, 5, 35-47.