Natnicha Bunyodom และ Songchai Ugsonkid;Wandee Kasemsukpipat. (2023) The Effect of Learning Management Based on Constructivist Theory Using Hand-on Activities of Grade 6 Students’ Geometrical Concepts on Triangle. <i>Interdisciplinary Academic and Research Journal</i>, <i>3</i>(5), 481-496.Natnicha Bunyodom และ Songchai Ugsonkid;Wandee Kasemsukpipat. "The Effect of Learning Management Based on Constructivist Theory Using Hand-on Activities of Grade 6 Students’ Geometrical Concepts on Triangle". Interdisciplinary Academic and Research Journal 3 (2023):481-496.Natnicha Bunyodom และ Songchai Ugsonkid;Wandee Kasemsukpipat. The Effect of Learning Management Based on Constructivist Theory Using Hand-on Activities of Grade 6 Students’ Geometrical Concepts on Triangle. DR.KEN Institute of Academic Development and Promotion.:ม.ป.ท. 2023.