Federal Reserve Bank of Dallas. "Chain Letter Scheme Using Savings Bonds," District Notices (Federal Reserve Bank of Dallas) (October 31, 1957). https://fraser.stlouisfed.org/title/5569/item/551227, accessed on April 19, 2024.
Federal Reserve Bank of Dallas. "Chain Letter Scheme Using Savings Bonds," District Notices (Federal Reserve Bank of Dallas) (October 31, 1957). https://fraser.stlouisfed.org/title/5569/item/551227, accessed on April 19, 2024.