1. Accident Facts, 1982 Edition. National Safety Council, Chicago, Illinois.
2. William Farr: Founder of modern concepts of surveillance;Langmuir;Int. J. Epidemiology,1976
3. Occupational Injuries and Illnesses in the United States by Industry,1981
4. Episodes of persons injured: United States, 1975;Ries,1978
5. BLS develops measure of job risk by occupation;Root;Monthly Labor Review,1981