1. Centers for Medicare & Medicaid Services CMS.gov http://www.cms.gov/Medicare/Medicare-General-Information/MedicareGenInfo/index.html
2. Centers for Medicare & Medicaid Services CMS.gov http://www.cms.gov/About-CMS/Agency-Information/History/index.html?redirect=/history/
3. USA Social Security Administration - Medicare http://www.ssa.gov/pubs/EN-05-10043.pdf
4. Rettig RA Origins of the medicare kidney disease entitlement: the social security amendments of 1972 http://www.nap.edu/openbook.php?record_id=1793&page=176
5. The first decade. The story of the birth of Canadian Medicare in Saskatchewan and its development during the following ten years;MacTaggart;Can Med Assoc J,1972