Phutthala, K., and W. Phongsiri. “A Developing of Strengthen Guidelines for Primary Students of Private Schools, Chaiyaphum Province”. Academic Journal of Mahamakut Buddhist University Roi Et Campus, vol. 9, no. 1, June 2019, pp. 185-94, https://so01.tci-thaijo.org/index.php/AJMBU/article/view/242155.