chaiyanich, . P. ., & Pluempan, R. (2020). RESEARCH BASED ON THE PRINCIPLES OF CREATING HAPPINESS AND CHANGES IN LEANING PROCESS. Journal of Liberal Art of Rajamangala University of Technology Suvarnabhumi, 2(3), 557–566. Retrieved from https://so03.tci-thaijo.org/index.php/art/article/view/248780