Hanpipat, B., and V. Roadrangka. “In-depth study of geology teachers’ teaching practices in the upper secondary levels under the Bangkok Educational Services, area 2”. Asia-Pacific Journal of Science and Technology, vol. 14, no. 12, Apr. 2017, pp. 1143-57, https://so01.tci-thaijo.org/index.php/APST/article/view/83608.