Marattana, Chothip, and Wasana Keeratichamroen. 2018. “A STUDY OF LEARNING OUTCOMES ON MATERIALS AND PROPERTIES OF MATERIALS LEARNING UNIT OF GRADE 5 STUDENTS USING STEM EDUCATION”. Research Community and Social Development Journal 12 (3). Nakhon Ratchasima, Thailand:149-62. https://so04.tci-thaijo.org/index.php/NRRU/article/view/135505.