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2. Chapin, H. D. and Royster, L. T.: Pediatrics. Ed. 7. Baltimore, Wm. Wood & Co., 1933.
3. Merck Manual. Ed. 7. Rahway. New Jersey, Merck & Co., Inc., 1940.
4. Davison, W. C.: The Compleat Pediatrician. Ed. 4. Durham, North Carolina, Duke University Press, 1944.
5. Zahorsky, T. S.: Synopsis of Pediatrics. Ed. 5. St. Louis, C. V. Mosby Co., 1948.