Aunthongsiri, S., Hajisalah, S., Janjaroon, A. and Piasai, K. (2021) “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(2), pp. 125-139. vailable at: https://so03.tci-thaijo.org/index.php/rpu/article/view/254780 (ccessed: 28November2021).