1. 2. "Memorandum on Neonatal Mortality" 1943 , British Paediatric Association, London.
2. 3. J. C. Spence, and F. J. W. Miller "Report of an Investigation into the Causes of Infantile Mortality in Newcastle-upon-Tyne." 1939 .
3. 5. By courtesy of the Registrar General and Statistician, Northern Ireland.