Singh, R., T. R. P. Reddy, and T. S. Kumar. “A Comparative Study of Open (Milligan-Morgan) Versus Closed (Ferguson) Haemorrhoidectomy With and Without Internal Sphincterotomy”. International Surgery Journal, vol. 6, no. 2, Jan. 2019, pp. 443-6, doi:10.18203/2349-2902.isj20190078.