N. Issaranusorn, P. Nasok, W. Srirak, S. Mesub, R. Mangsachart, and S. Saduakdee, “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 ”, edunsruj, vol. 9, no. 2, pp. 131–144, Jun. 2026.