Saelee, Chongchit. “Cost and Sensitivity Analysis of Investment Project in Cleaning Service Business: Case Study of Me D Property Service Management Company Limited”. Business Administration and Economics Review 17, no. 1 (February 1, 2021): 40–56. accessed August 17, 2025. https://so15.tci-thaijo.org/index.php/bae/article/view/657.