Amir, Muhammad, Sarah Hafeez, Muhammad Adrees, Amir Nazir, and Hafiz Mughees Ather. “Causes of Upper Gastrointestinal Bleeding on Endoscopy in Tertiary Care Hospital”. Annals of Punjab Medical College 14, no. 3 (September 30, 2020): 263-267. Accessed July 3, 2024. https://apmcfmu.com/index.php/apmc/article/view/695.