- US Bureau of Labor Statisticswww.bls.gov
- American Medical Associationwww.ama-assn.org
- National Institutes of Healthwww.health.nih.gov
- US Department of Health and Human Serviceswww.hhs.gov
- US Department of Laborwww.dol.gov
- American Health Care Associationwww.ahcancal.org
