Kafle, P., C. Praveen, S. Kumar, B. Patowary, N. Maharjan, S. Shah, and S. Agrawal. “Retrorectal Tumors: Report of Two Cases”. Journal of College of Medical Sciences-Nepal, vol. 8, no. 4, Sept. 2013, pp. 46-50, doi:10.3126/jcmsn.v8i4.8701.