Nathongchai, Jukkapun, Samarn Ekkapim, and Poosit Boontongtherng. 2023. “Developing a Learning Management Model to Promote the Problem-solving Capabilities Analytical for 6th Graders”. Interdisciplinary Academic and Research Journal 3 (3). Maha Sara Kham, TH.:83-96. https://doi.org/10.14456/iarj.2023.116.