น่วมอยู่ ว, ณ สงขลา ใ. A DEVELOPMENT OF INSTRUCTIONAL PACKAGE OF MECHANICAL WITH DESIGN PROCESS TO ENHANCE SYSTEM THINKING OF ELEMENTARY SCHOOL STUDENTS. ECT Journal [Internet]. 2020 Jun. 28 [cited 2024 Apr. 29];15(18):1-11. Available from: https://so01.tci-thaijo.org/index.php/ectstou/article/view/228394