1. . (1988): “Economic Scope of Occupationally-Induced Back Pain”. Research Summary No. 66. Institute de recherche en santé et en securité du travail du Québec. Quebec: IRSST.
2. . (1989): “Current estimates from the National Health Interview Survey: United States, 1988”. Hayttsville: National Center for Health Statistics. (Vital and Health Statistics, Series 10: Data from the National Health Interview Survey, no. 173). DHHS publication no. PHS89-1501.
3. Epidemiological Aspects of Back Pain
4. Anonymous. (1976): “Low back pain and its relationship to work place factors and individual factors- review of literature, Partial Report 2”. Ryggskador i Arbetslivet.