United States Government Accountability Office (GAO).Prescription drugs: improvements needed in FDA's oversight of direct-to-consumer advertising, GAO-07–54.www.gao.gov. Published November 16, 2006. Accessed November 7, 2008.
2.
United States Government Accountability Office (GAO).Prescription drugs: trends in FDA's oversight of direct-to-consumer advertising, GAO-08–758T.www.gao.gov. Published May 8, 2008. Accessed November 7, 2008.