1. Employer-sponsored health insurance in the United States: Origins and implications. New;Blumenthal;England Journal of Medicine,2006
2. Centers for Medicare and Medicaid Services 2014 What are the different types of health insurance? HealthCare.gov https://www.healthcare.gov/what-are-the- different-types-of-health-insurance
3. Health insurance and the elderly;Chulis;Health Affairs,1993
4. Claxton , G. Lundy , J. 2008 How private health coverage works: A primer. Kaiser Family Foundation http://kff.org/health-costs/issue-brief/how-private-health-coverage-works-a-primer
5. Claxton , G. Rae , M. Panchal , N. Damico , A. Bostick , N. Kenward , K. Whitmore , H. 2014 2013 Employer Health Benefits Survey. Kaiser Family Foundation http://kff.org/private-insurance/report/2013-employer-health-benefits