S. . Sujiva, P. Thanaboonpuang, T. Laosum, S. Ingchatcharoen, W. . Simpol, and A. Prathumthai, “Cognitive skills of secondary school students: A tentative model and an online test”, kasetsart J. Soc. Sci., vol. 41, no. 3, pp. 598–603, Dec. 2020.