Sriyoo, P. ., Thanompongchart, P. ., & Sudrung, J. . (2021). Strategies for Instructional Supervision in Secondary Schools under the Office of the Secondary of the Secondary Educational Service Area 7. An Online Journal of Education, 16(1), OJED1601011(15 pages). Retrieved from https://so01.tci-thaijo.org/index.php/OJED/article/view/245058