Wanintorn Poonpaiboonpipat และ Nitjarin Kutpun. (2026) Developing Mathematical Reasoning Skills on CER Framework of Grade 8 Students in Opportunity Expansion Schools through Mathematical Argumentation Activities on the Pythagorean Theorem. <i>Journal of Science and Science Education</i>, <i>9</i>(1), 129-144.Wanintorn Poonpaiboonpipat และ Nitjarin Kutpun. "Developing Mathematical Reasoning Skills on CER Framework of Grade 8 Students in Opportunity Expansion Schools through Mathematical Argumentation Activities on the Pythagorean Theorem". Journal of Science and Science Education 9 (2026):129-144.Wanintorn Poonpaiboonpipat และ Nitjarin Kutpun. Developing Mathematical Reasoning Skills on CER Framework of Grade 8 Students in Opportunity Expansion Schools through Mathematical Argumentation Activities on the Pythagorean Theorem. Faculty of Science, Ubon Ratchathani University:ม.ป.ท. 2026.