Pantaranontaka, K., W. Sawekngam, and A. Makanong. “Development of an Instructional Model based on Mathematization Approach and Realistic Mathematics Education to Enhance Mathematical Problem Solving and Reasoning Abilities of Lower-secondary School Students”. Journal of Education Studies, Chulalongkorn University, vol. 48, no. 3, Sept. 2020, pp. 21-40, doi:10.14456/educu.2020.19.