Sirion A, Srimarut B, Pranpa M. Management Skills of Administrators in the 21st Century Affecting Teacher’s Functional Competency in Opportunity Expansion Schools in Bangkok Metropolitan Administration, East Bangkok Zone . rpujournal [internet]. 2023 Aug. 26 [cited 2026 Aug. 29];9(2):392-410. available from: https://so03.tci-thaijo.org/index.php/rpu/article/view/271215