Nilchavee, Pornsiri, Manoon Siwaron, and Tawil Laddawan. “The Strategy of Effective Work Management in Secondary Schools, under The Office of Secondary Educational Service Area 20”. Dhammathas Academic Journal 17, no. 3 (February 8, 2018): 297–310. accessed October 11, 2026. https://so06.tci-thaijo.org/index.php/dhammathas/article/view/101448.