Boonradsamee, B., and W. Tangkuptanon. “Preventive Maintenance System Development Project Management: A Case Study in a Medium Scale Industrial Factory”. Interdisciplinary Research Review, vol. 13, no. 6, Jan. 2019, pp. 1-7, https://ph02.tci-thaijo.org/index.php/jtir/article/view/167443.