ยุพัฒน์ พ. “Factors That Are a Problem in the Efficiency of Construction Supervision in Phnom Penh, Cambodia”. Pathumthani University Academic Journal, vol. 11, no. 1, June 2019, pp. 25ุ6-266, https://so05.tci-thaijo.org/index.php/ptujournal/article/view/191659.