1. London's third airport;Adams;Geograph. J.,1971
2. Temporary manual for the consideration of losses to the people's economy from road accidents;Babkov,1970
3. Cost of road accidents in Great Britain;Dawson;Ministry of Transport, Road Research Laboratory Report,1967
4. Current costs of road accidents in Great Britain;Dawson;Department of the Environment, Road Research Laboratory Report,1971
5. Cost-effectiveness in traffic safety;Little A.D. Inc.,1968