1. Skull X-rays after head injury;Laws;Lancet,1981
2. Mortality statistics;Office of Population Censuses,1975
3. Hospital In-patient Enquiry,1975
4. Age distribution of extradural haemorrhage without skull fracture;Galbraith;Lancet,1973
5. If my son had a head injury;Jennett;Br Med J,1978