1. BIRTH WEIGHTS AND PLACENTAL WEIGHTS IN PRE-ECLAMPSIA
2. N. Butler, M. Dawkins, and W. G. MacGregor (1965 ): InGestational age, size and maturity , Clinics in Developmental Medicine, No. 19. Spastics Society/Heinemann, London, p. 74 .
3. Growth of the human fetus
4. R. Illsley, J. C. Kincaid, N. R. Butler, and D. G. Bonham (1963 ): InPerinatal Mortality; the first report of the 1958 British Perinatal Mortality Survey , by. Livingstone, Edinburgh, p. 270 .