Nuankum , T., A. Unahalekhaka, and J. Chitreecheur. “Effects of Knowledge, Feedback and Equipment Provision on Practices and Efficiency of Environmental Cleaning Among Personnel in General Hospital”. Nursing Journal CMU, vol. 48, no. 2, June 2021, pp. 13-25, https://he02.tci-thaijo.org/index.php/cmunursing/article/view/251494.