Asamo (Phuak-on), P.; (Udomsak Uttamasakko), P.; Mahachano, P. C.; Chanruang, S. A STUDY OF THE DEVELOPMENT GUIDELINES OF TEACHING TECHNIQUES OF TEACHERS IN THE 21ST CENTURY OF BUDDHIST SUNDAY SCHOOL MAHACHULALONGKORNRAJAVIDYALAYA UNIVERSITY. Education MCU 2020, 7, 110-120.