1. The Borderline of Embryology and Pathology;Willis,1958
2. Sacrococcygeal teratoma: report of a case in an infant;Wesley;S Afr Med J,1964
3. Tumors ventral to the sacrum;Whittaker;Am Surg,1938
4. Sacral and presacral tumors;Ross;Am J Surg,1948
5. Combined pelvic and retroperitoneal teratomas in infancy and childhood;Arnheim;Pediatrics,1952