1. [1] Bhakta KY. Tests for pulmonary surfactant. In: Cloherty JP. edr. Manual of neonatal care. 7th edn. 2011:406-7.
2. [2] Singh M. Care of the newborn. 7th edn. 2010: p. 283.
3. [3] Nelson's Textbook of Pediatrics. 19th edn. 2011: p. 581.
4. Birthweight, gestational age and sex determining factor in incidence of respiratory distress syndrome of prematurely born infants;HC;J Pediatrics,1968
5. [5] Peterson HG, Pendleton ME. Contrasting roentgenographic pulmonary patterns of HMD. Am J Roentgenography 1961;74:800.