T. . Thongprong, K. . Singprasong, K. . Theerawit, P. . Youngsapanan, and P. . Sunthornklam, “A Study of Problems on Using Innovation for Teaching in the Demonstration School of Ramkhamhaeng University (Secondary School)”, AMJ, vol. 4, no. 1, pp. 124–139, Apr. 2020.