Apiratanawong, S. “Discharge Planning Among Chronic Obstructive Pulmonary Disease Patients With Acute Exacerbation Symptoms Experience Frequent Hospital Admissions”. NU Journal of Nursing and Health Sciences, vol. 15, no. 3, Oct. 2021, pp. 1-12, https://he01.tci-thaijo.org/index.php/NurseNu/article/view/252028.