Board of Governors of the Federal Reserve System (U.S.), 1935-. "February 1980 : Assets and Liabilities Outstanding, 1969-79," Z.1 Financial Accounts of the United States (February 1980). https://fraser.stlouisfed.org/title/93/item/579566, accessed on December 1, 2023.
http://rightsstatements.org/vocab/NoC-US/1.0/