1. Running light questionnaire;Allen;Am. J. Optom. Arch. Am Acad. Optom.,1965
2. The current status of automobile running lights;Allen;J. Am. Optom. Assoc.,1979
3. Automobile running lights — a research report;Allen;Am. J. Optom. Arch. Am. Acad. Optom.,1964
4. The effects on accidents of compulsory use of running lights during daylight in Sweden;Andersson,1981
5. Effekt p>ȧ trafikolyckor av rekommenderad och pȧkallad användning av varselljus i Finland;Andersson,1976