P. P. D. (Phumirang, V. Thongdee, P. Sangsai, and P. Kusumal, “Learning Management for Developing lower Secondary Students’ Morality in Social Studies Religion and Culture Essential Subject Group of Schools under Khon Kaen Municipality”, jg-mcukk, vol. 6, no. 4, pp. 123–136, Dec. 2019.