S. Yormprakhon, D. Wattanakitkrileart, K. Pongthavornkamol, and C. Chuchottaworn, “The Influence of Health Literacy, Perceived Social Support, and Uncertainty in Illness on Functional Status in Patients with Chronic Obstructive Pulmonary Disease”, NURS SCI J THAIL, vol. 32, no. 3, pp. 64–73, Dec. 2014.