น่วมอยู่ วรัชญ์, and ณ สงขลา ใจทิพย์. “A DEVELOPMENT OF INSTRUCTIONAL PACKAGE OF MECHANICAL WITH DESIGN PROCESS TO ENHANCE SYSTEM THINKING OF ELEMENTARY SCHOOL STUDENTS”. ECT Education and Communication Technology Journal 15, no. 18 (June 28, 2020): 1–11. accessed September 3, 2026. https://so01.tci-thaijo.org/index.php/ectstou/article/view/228394.