1. History of Hemorrhoids;Laufman;Am. J. Surg.,1941
2. Practical Proctology;Buie,1938
3. Hemorrhoidectomy;Campbell;Tr. Am. Proct. Soc.,1936
4. Protoscopic Examination and the Treatment of Hemorrhoids and Pruritus Ani;Malmgren,1931
5. Hemorrhoids; Etiology and Pathology;Gass;Am. J. Surg.,1950