1. Assmann, H.: Klinisehe Roentgendiagnostik der inneren Krankheiten; F. C. W. Vogel, Leipzig, 1924.
2. Beer, E.: Intrahepatische Cholelithiasis, Arch. f. kl. Chir., 1904. 74, 115–152.
3. Behrend, Moses: Diseases of the gallbladder and allied structures; F. A. Davis Comp., Phil. 1947.
4. Boekus, Henry L.: Gastroenterology; 3 vol., W. B. Saunders, Phil.-London, 1946.
5. Buckstein, J.: Clinical Roentgenology of the Almentary Tract; w. B. Saunders, Phil.-London, 1940.