Muktapa Yu-piam และ Jinnadit Laorpaksin. (2026) Development of Mathematical Activity Packages Using Problem-Based Learning to Enhance Mathematical Communication Ability. <i>An Online Journal of Education (OJED)</i>, <i>21</i>(2), 1-19.Muktapa Yu-piam และ Jinnadit Laorpaksin. "Development of Mathematical Activity Packages Using Problem-Based Learning to Enhance Mathematical Communication Ability". An Online Journal of Education (OJED) 21 (2026):1-19.Muktapa Yu-piam และ Jinnadit Laorpaksin. Development of Mathematical Activity Packages Using Problem-Based Learning to Enhance Mathematical Communication Ability. Centre for Education Innovation, Print and Online Media:ม.ป.ท. 2026.