น่วมอยู่ ว., and ณ สงขลา ใ. . “A DEVELOPMENT OF INSTRUCTIONAL PACKAGE OF MECHANICAL WITH DESIGN PROCESS TO ENHANCE SYSTEM THINKING OF ELEMENTARY SCHOOL STUDENTS”. Education and Communication Technology Journal, vol. 15, no. 18, June 2020, pp. 1-11, https://so01.tci-thaijo.org/index.php/ectstou/article/view/228394.