Khamthung, R., N. Suwonnaroop, N. Kitnarong, and N. Watthayu. “The Relationships Among Knowledge of Glaucoma, Perceived Susceptibility, Received Information and Preventive Behavior of Glaucoma in Population at Risk”. Nursing Science Journal of Thailand, vol. 29, no. 2, June 2011, pp. 93-101, https://he02.tci-thaijo.org/index.php/ns/article/view/2821.