Thornpho, T., P. Panya, and P. Worakham. “Development of Science Learning Activities on ‘ Substance and Properties of substance’ to Promote Problem Solving Skills for Sixth-grade Students”. Journal for Developing the Social and Community, vol. 11, no. 3, Dec. 2024, pp. 495-16, https://so03.tci-thaijo.org/index.php/rdirmu/article/view/273318.