Thurathong, T., Chancharoen, D., Tanchaisak, K., & Cruthaka, C. (2022). The Development of a Training Program to Enhance the Essential Competencies of Salespersons in the Beauty Surgery Business. Ph.D. In Social Sciences Journal, 12(3), 745–758. Retrieved from https://so05.tci-thaijo.org/index.php/phdssj/article/view/247998