Lertwaritnan , Panjapa, and Udomluck Kulapichitr. “Proposed Guidelines for Internal Quality Assurance of Child Care Centers”. Journal of Education Studies 48, no. 2 (June 30, 2020): 165–183. Accessed April 30, 2024. https://so02.tci-thaijo.org/index.php/EDUCU/article/view/243203.