Boonmeepipit, Ekachai. “Internal Supervision Operations Related to Teaching Efficiency of Teachers in School Under the Office of Ratchaburi Primary Educational Service Area 1”. Journal of Humanities and Social Sciences Review 28, no. 1 (June 24, 2026): 49–58. accessed September 13, 2026. https://so05.tci-thaijo.org/index.php/hspbruacthjournal/article/view/290353.