1. Kaiser Family Foundation Prescription Drug Trends 2010 www.kff.org/rxdrugs/upload/3057-08.pdf
2. Centers for Medicare & Medicaid Service National Health Expenditures 2011 Highlights www.cms.gov/Research-Statistics-Data-and-Systems/Statistics-Trends-and-Reports/NationalHealthExpendData/downloads/highlights.pdf
3. Congressional Budget Office Offsetting Effects of Prescription Drug Use on Medicare's Spending for Medical Services 2012 www.cbo.gov/publication/43741
4. Dor A Encinosa W Does Cost Sharing Affect Compliance? The Case of Prescription Drugs . 2004
5. Exploring racial and ethnic disparities in prescription drug spending and use among Medicare beneficiaries;Gaskin;J Geriatr Pharmacother,2006