1. Allingham, William and H. W. Allingham: The Diagnosis and Treatment of Diseases of the Rectum Being a Practical Treatise on Fistula Piles, Fissure and Painful Ulcer, Procidentia, Polypus, Stricture, Cancer, Etc., Ed. 7, London, Baillière, Tindall and Cox, 1901, 471 pp.
2. Bacon, H. E., E. J. Lowell, Jr., and H. D. Trimpi: Villous Papillomas of Colon and Rectum: Study of 28 Cases with End Results of Treatment Over 5-year Period, Surgery.33: 77, 1954.
3. Bacon, H. E. and H. D. Trimpi: The Colon. In Babcock’s Principles and Practice of Surgery, Ed. 2, Philadelphia, Lea & Febiger, 1954, pp. 1397–1442.
4. Baumel, J. and G. Hermann: Les tumeurs villeuses du rectum génératrices de cancers rectaux, Acta gastro-enterol. Belg.10: 89, 1947.
5. Bensaude, R., A. Cain and A. Lambling: Les tumeurs villeuses du rectum, Presse méd.2: 1713, 1930.