Bosman FT, Carneiro F, Hruban RH, Thiese ND (Eds). WHO Classifiication of Tumors of the Digestive System, IARC, Lyon 2010
Kong CS, Welton ML, Longacre TA. Role of human papilloma virus in squamous cell metaplasia-dysplasia-carcinoma of the rectum. Am J Surg Pathol. 2007 Jun;31(6):919-25.
Nahas CS, Shia J, Joseph R, Schrag D, Minsky BD, Weiser MR, Guillem JG, Paty PB, Klimstra DS, Tang LH, Wong WD, Temple LK. Squamous-cell carcinoma of the rectum: a rare but curable tumor. Dis Colon Rectum. 2007 Sep;50(9):1393-400.
Frizelle FA, Hobday KS, Batts KP, Nelson H. Adenosquamous and squamous carcinoma of the colon and upper rectum: a clinical and histopathologic study. Dis Colon Rectum. 2001 Mar;44(3):341-6.