Phetdee, W. ., and P. . Potiwan. “The Development of Learning Activities by Using Inquiry-Based-Learning on Sufficiency Economy With Product Manufacturing and Service for MatthayomSuksa 2 Students”. Journal of Education Rajabhat Maha Sarakham University, vol. 18, no. 3, Jan. 2022, pp. 11-22, https://so06.tci-thaijo.org/index.php/edu-rmu/article/view/253913.