1. ACC and the National Health Committee. New Zealand Acute Low Back Guide. Wellington, New Zealand, 1997.
2. Occupational low back pain: assessment, treatment, and prevention;Anderrson,1991
3. Industrial low back pain;Bigos,1990
4. Bureau of Labor Statistics, from http://data.bls.gov/surveymost, 2002.
5. Schedule for Nonadaptive and Adaptive Personality (SNAP);Clark,1993