Board of Governors of the Federal Reserve System (U.S.), 1935-. "The 2010 Federal Reserve Payments Study : Noncash Payment Trends in the United States: 2006 — 2009 (Summary Report)," Federal Reserve Payments Study (April 5, 2011). https://fraser.stlouisfed.org/title/6092/item/584827, accessed on March 23, 2025.