Yousuf, M., M. J. Hannan, M. Badruddoza, and T. Banu. “Endoscopic Retrograde Cholangiopancreatography in Pediatric Patient Population: Bangladesh Perspective”. Bangladesh Journal of Endosurgery, vol. 1, no. 3, Jan. 2014, pp. 9-12, https://www.banglajol.info/index.php/BJE/article/view/17593.