1. Management of sacrococcygeal tumors;McCune;Ann. Surg.,1964
2. Benign and malignant sacrococcygeal teratomas;Donnellan;Surgery,1968
3. Pediatric Surgery;Benson,1962
4. Contribution a l'etude des tumeurs congenitales d'origine parasitaire de la region sacrococcygienne;Calbet,1893
5. Beitraege zur Kenntnis der Genese der Ovarialembryome;Bosaeus,1926