1. The Abbreviated Injury Scale: AIS-80/Committee on Injury Scaling;American Association for Automotive Medicine,1980
2. Specifications for Protective Headgear for Vehicular Users;American National Standards Institute,1971
3. The Book of Motorcycles, Trail Bikes and Scooters,1965
4. The NFL's Official Encyclopedia History of Professional Football,1977
5. Industrial Safety Helmets (Light Duty);British Standards Institute,1958