Aunthongsiri, Sawittree, Sukanya Hajisalah, Anek Janjaroon, and Khawn Piasai. “A Study of Matthayomsuksa II Students’ Geometric Proof Abilities in a Topic of Geometric Reasoning through Learning Activities with Graphic Organizer and Inquiry Process”. Journal of Humanities and Social Sciences, Rajapruk University 7, no. 2 (August 25, 2021): 125–139. accessed September 11, 2026. https://so03.tci-thaijo.org/index.php/rpu/article/view/254780.