Siti Azrin Ab Hamid, et al. “A DESCRIPTIVE STUDY ON OESOPHAGEAL CANCER IN HOSPITAL UNIVERSITI SAINS MALAYSIA”. Asian Journal of Medicine & Health Sciences, vol. 3, no. 1, June 2020, pp. 44-51, https://ejournal.unikl.edu.my/index.php/ajmhs/article/view/46.