Chaichompoo, R., A. Namvongprom, N.- oy Pakdevong, B. Preechakoon, and T. Ounlam. “Relationship between Symptom Severity and Distress in Patients with Advanced Cancer”. NU Journal of Nursing and Health Sciences, vol. 13, no. 4, Dec. 2019, pp. 107-20, https://he01.tci-thaijo.org/index.php/NurseNu/article/view/215437.