S. . Khanvises, A. P. D. . Saengsai, W. . Nachaisin, and PhrakruSuntornwinairos, Dr., “DEVELOPMENT OF TEACHING MATERIALS FOR 21ST CENTURY SKILLS IN ECONOMICS KHWAORAI SUKSA SCHOOL KOSUM PHISAI DISTRICT MAHA SARAKHAM PROVINCE”, JBER, vol. 7, no. 2, pp. 160–170, Aug. 2021.