Wehaloy, W., Kunmud , N. and Chaiyapan, M. 2026. The Development of On-Time Assignment Submission Behavior of Matthayom 2 Students Using a Stamp Point Collection Reinforcement System at Patongprathankiriwat School, Hat Yai District, Songkhla Province. Journal of Social Science Kamphaeng Saen . 1, 2 (Aug. 2026), 31–39.