1. Holt, L.E. and R. McIntosh: Pediatrics, Ed. 12. New York , Appleton-Century-Crofts, 1953, p. 534.
2. Nelson, W.E.: Textbook of Pediatrics, Ed. 7. Philadelphia, W. B. Saunders, 1959 , pp. 786-792.
3. Penicillin: Its use in pediatrics
4. Holt, L.E.: Diseases of Infancy and Childhood. New York, D. Appleton and Company, 1898, p.529.