U-Thanang, N., and N. Weerakit. “A Comparative Study of Psychological Empowerment and Employee Commitment between Chain-affiliated and Independent Hotels in Krabi”. Journal of International Studies, Prince of Songkla University, vol. 5, no. 1, June 2015, pp. 99-118, https://so03.tci-thaijo.org/index.php/jis/article/view/245784.