Issaranusorn, N., Nasok, P., Srirak, W., Mesub, S., Mangsachart, R., & Saduakdee, S. (2026). The Development of Mathematics Learning Achievement in Data Presentation and Interpretation using Graphs through the Teams–Games–Tournament (TGT) Instructional Model Integrated with Polya’s Problem-Solving Process for Grade 7 Students . Education journal Faculty of Education, Nakhon Sawan Rajabhat University, 9(2), 131–144. https://doi.org/10.2774.EDU2026.2.285861