C. Riangkam, D. Wattanakitkrileart, A. Ketcham, and A. Sriwijitkamol, “Health Literacy, Self-Efficacy, Age and Visual Acuity Predicting on Self-Care Behaviors in Patients with Type 2 Diabetes”, ์Nurs Sci J Thail, vol. 34, no. 4, pp. 35–46, Dec. 2016.