Nilchavee, P., Siwaron, M. and Laddawan, T. (2018) “The Strategy of Effective Work Management in Secondary Schools, under The Office of Secondary Educational Service Area 20”, Dhammathas Academic Journal, 17(3), pp. 297–310. available at: https://so06.tci-thaijo.org/index.php/dhammathas/article/view/101448 (accessed: 11 October 2026).