- National Institutes of Healthhealth.nih.gov
- U.S. Bureau of Labor Statisticswww.bls.gov
- U.S. Department of Laborwww.dol.gov
- American Health Care Associationwww.ahcancal.org
- American Staffing Association americanstaffing.net
- American Medical Association www.ama-assn.org
