Vonk L, Tanatwanit Y, Kunsongkeit W. “Factors Predicting Loneliness of Hospitalized Cancer Patients in Chonburi Cancer Hospital”. Journal of The Department of Medical Services, vol. 43, no. 4, Dec. 2020, pp. 131-6, https://he02.tci-thaijo.org/index.php/JDMS/article/view/248006.