Jeffrey PJ, Ritchie JK, Parks AG. Treatment of hemorrhoids in patients with inflammatory bowel disease. Lancet 1977;1:1084–5.
Levien DH, Surrell JA, Mazier WP. Surgical treatment of anorectal fistula in patients with Crohn's disease. Surg Gynecol Obstet 1989;169:133–6.
Morrison JG, Gathright JB Jr, Ray JE, Ferrari BT, Hicks TC, Timmcke AE. Surgical management of anorectal fistulas in Crohn's disease. Dis Colon Rectum 1989;32:492–6.
Williams DR, Coller JA, Corman ML, Nugent FW, Veidenheimer MC. Anal Complications in Crohn's disease. Dis Colon Rectum 1981;24:22–4.
Atwell JD, Duthie JL, Goligher JC. The outcome of Crohn's disease. Br J Surg 1965;52:966–72.
Fielding JF. Perianal lesions in Crohn's disease. J R Coll Surg Edinb 1972;17:32–7.
Schofield PF. The natural history and treatment of Crohn's disease. Ann R Coll Surg Engl 1965;36:258–79.
Lockhart-Mummery HE. Pathologic lesions of the anal region associated with Crohn's disease. Dis Colon Rectum 1965;8:399–401.
Baker WN, Milton-Thompson GJ. Management of anal fistulas in Crohn's disease. J R Soc Med 1974;67:8.
Bernard D, Morgan S, Tasse D. Selective surgical management of Crohn's disease of the anus. Can J Surg 1986;29:318–21.
Wolff BG, Culp CE, Beart RW Jr, Ilstrup DM, Ready DL. Anorectal Crohn's disease: a long-term perspective. Dis Colon Rectum 1985;28:709–11.
Alexander-Williams J, Buchmann P. Perianal Crohn's disease. World J Surg 1980;4:203–8.
Buchmann P, Keighley MR, Allan RN, Thompson H, Alexander-Williams J. Natural history of perianal Crohn's disease. Ten years follow-up: a plea for conservatism. Am J Surg 1980;140:642–4.
Cohen Z. Crohn's disease: perianal. In: Fazio VW, ed. Current therapy in CNR surgery. Toronto: B.C. Decker, 1990:199–202.