SARITAŞ, Ülkü, et al. “The Role of Endoscopic Ultrasonography in Choledocholithiasis”. Turkish Journal of Gastroenterology, vol. 6, no. 2, Apr. 2020, pp. 228-30, https://turkjgastroenterol.avesjournals.com/index.php/tjg/article/view/483.