- American Staffing Associationwww.americanstaffing.net
- International Council of Nurseswww.icn.ch
- National Institutes of Healthwww.health.nih.gov
- US Bureau of Labor Statisticswww.bls.gov
- US Department of Health and Human Serviceswww.hhs.gov
- US Department of Laborwww.dol.gov
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