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2. Beach, William W. and Gareth G. Davis. 1998. Social Security’s Rate of Return. Heritage Foundation Study, January 15.
3. Board of Trustees, Social Security Trust Funds (BT). 2009. The 2009 Annual Report of the Board of Trustees of the Federal Old-Age and Survivors Insurance and Federal Disability Insurance Trust Funds U.S. Government Printing Office, Washington.
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5. Board of Trustees, Social Security Trust Funds (BT). 2011. The 2011 Annual Report of the Board of Trustees of the Federal Old-Age and Survivors Insurance and Federal Disability Insurance Trust Funds. U.S. Government Printing Office, Washington.