1. Bhatt, R.D. and Pathak, A.T. (1969). Separation of umbilical stump.Pediatr. Clin. India,4, 373.
2. Craig, W.S. (1962). Care of the Newly Born Infant. p. 205, Livingstone, Edinburgh.
3. Cooke, R.E. and Levin, S. (1968). The Biologic Basis of Pediatric Practice. P. 1469. McGraw Hill Book Company, New York.
4. Crosse, V.M. (1961). The Premature Baby. p. 146. J & A Churchill Ltd., London.
5. Illingworth, R.S. (1964). The Normal Child. p. 90. J & A Churchill Ltd., London.