1. John Glenn's three orbits of the earth;Voas;Natl Geogr Mag,1962
2. US Department of Transportation 1968 Alcohol and Highway Safety Report to the US Congress 1968
3. Evaluation of the ASAPs;Levy;J Safety Res,1977
4. The specific deterrent effectiveness of ASAP education and rehabilitation programs;Nichols;J Safety Res,1978