Federal Reserve Bank of St. Louis. "February 20, 2015 : Advance Edition, February 19, 2015," U.S. Financial Data (February 20, 2015). https://fraser.stlouisfed.org/title/5335/item/537729/content/pdf/frbsl_usfd_20150219, accessed on January 25, 2021.
Federal Reserve Bank of St. Louis