Kanjanama, C., R. Taweephol, M. Boonmeesrisanga, and T. Chantuk. “Attributes of outsourcing companies providing housekeeping services for five-star international hotel chains in Bangkok”. Journal of Social Science Panyapat, vol. 7, no. 3, Sept. 2025, pp. 113-24, https://so06.tci-thaijo.org/index.php/JSSP/article/view/286191.