1. The Collaborative Study on Cerebral Palsy, Mental Retardation, and Other Neurological and Sensory Disorders of Infancy and Childhood: The Women and Their Pregnancies;Niswander,1972
2. The Physiology of Human Pregnancy;Hytten,1964
3. Chase, H. C.: International Comparison of Perinatal and Infant Mortality: United States and Six Western European Countries. Public Health Service Publication No. 1000, Series 3, No. 6, Washington, D. C., U. S. Government Printing Office.
4. WEIGHT RELATIONSHIPS IN PREGNANCY