Keerasuntonpong, A., S. . Kesornsuk, S. . Trakulsomboon, and V. . Thamlikitkul. “Colonization of Nosocomial Pathogens on Computer Keyboards in Patient Care Areas”. Siriraj Medical Journal, vol. 57, no. 9, Sept. 2005, pp. 380-1, https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/245612.