Onpuy W. The Development of Learning Activities According to the STEM Education to Promote Systems Thinking Skills of Students in Early Childhood Education. GS KKU HS [Internet]. 2019 Jul. 31 [cited 2024 Apr. 26];7(3):183-9. Available from: https://so04.tci-thaijo.org/index.php/gskkuhs/article/view/235469