Toontong, Lawan, Doungrut Wattanakitkrileart, Kanaungnit Pongthavornkamol, and Charoen Chuchottaworn. 2013. “Factors Predicting Psychological Distress in Patients With Chronic Obstructive Disease”. Nursing Science Journal of Thailand 30 (1):40-48. https://he02.tci-thaijo.org/index.php/ns/article/view/10028.