1. O'dea, W.T.: The social history of lighting, (Routledge and Kegan Paul, London 1958)
2. Department of Transport: ‘Road accidents, Great Britain 1980’ (HMSO, 1981)
3. ‘Some effects on accidents of changes in light conditions at the beginning and end of British summer time’, Transport and Road Research Laboratory, Report SR 587, Crowthorne, Berks, 1980