1. Cappell, D. F. (editor): Muir’s Text-Book of Pathology. Ed. 7, Baltimore, The Williams & Wilkins Company, 1958, 433 pp.
2. Gabriel, W. B.: The Principles and Practice of Rectal Surgery. Fifth ed., Springfield, Charles C Thomas, 1963, 739 pp.
3. Goligher, J. C.: Surgery of the Anus, Rectum and Colon. Springfield, Charles C Thomas, 1961, 829 pp.
4. Turell, R. (editor): Diseases of the Colon and Anorectum. Philadelphia, W. B. Saunders Company, 1959, 1,238 pp.