TAŞKIN, Vildan, et al. “Endoscopic Management of Non-Variceal Upper Gastrointestinal Bleeding: The Effects of Endoscopic Approaches on Treatment Success and Evaluation of Succes Rates According to Forrest Classification”. Turkish Journal of Gastroenterology, vol. 9, no. 4, Jan. 1998, pp. 335-9, https://turkjgastroenterol.org/index.php/tjg/article/view/920.