- American Staffing Associationwww.americanstaffing.net
- American Public Health Associationwww.apha.org
- National Institutes of Healthwww.health.nih.gov
- American Health Care Associationwww.ahcancal.org
- U.S. Department of Laborwww.dol.gov
- U.S. Bureau of Labor Statisticswww.bls.gov
