Prasongsuk, Chanapon, and Thanadol Phuseerit. 2025. “Development of Learning Activity Using Group Investigation for Promote Collaborative Problem Solving Competency of Mathayomsuksa 4 Students”. Journal for Developing the Social and Community 12 (2). Bangkok, Thailand:339-58. https://so03.tci-thaijo.org/index.php/rdirmu/article/view/290393.