1. Families USA. No bargain: Medicare drug plans deliver high prices [Internet]. Washington (DC): Families USA; 2007 Jan [cited 2009 Jun 11]. Available from: http://www.familiesusa.org/assets/pdfs/no-bargain-medicare-drug.pdf
2. Congressional Budget Office. Budget options volume I: health care [Internet]. Washington (DC): CBO; 2008 Dec [cited 2009 Jun 11]. Available from: http://www.cbo.gov/ftpdocs/99xx/doc9925/12-18-HealthOptions.pdf
3. CBO. Issues regarding drug price negotiation in Medicare, letter to the Honorable Ron Wyden [Internet]. Washington (DC): CBO: 2007 Apr 10 [cited 2009 Jun 11]. Available from: http://www.cbo.gov/ftpdocs/79xx/doc7992/DrugPriceNegotiation.pdf
4. U.S. Government Accountability Office. Prescription drugs: expanding access to federal prices could cause other price changes [Internet]. Washington (DC): GAO; 2000 Aug [cited 2009 Jun 11]. Available from: http://www.gao.gov/archive/2000/he00118.pdf
5. What if the Federal Government Negotiated Pharmaceutical Prices for Seniors? An Estimate of National Savings