Pommachak W, Vibulrangson S, Chaowachai S. Guidelines for Developing the Implementation of Internal Quality Assurance in Early Childhood Development Centers under Local Administrative Organizations in Nan Province. JOIM [internet]. 2026 Aug. 20 [cited 2026 Sep. 20];2(2):1-17. available from: https://so16.tci-thaijo.org/index.php/JOIM/article/view/3601