Mungkung, Peerayut. “Strategic Innovation for Enhancing Employee Engagement in Health and Beauty Centers in Thailand”. Ph.D. in Social Sciences Journal 15, no. 2 (July 31, 2025): 431–449. accessed August 30, 2026. https://so05.tci-thaijo.org/index.php/phdssj/article/view/275027.