Roadrangka, Vantipa, and Pimpan Dachakupl. “ Using the Activity Sets for Developing Science Process Skills”. Kasetsart Journal of Social Sciences 13, no. 2 (July 1, 1992): 187–194. accessed September 11, 2026. https://so04.tci-thaijo.org/index.php/kjss/article/view/244073.