Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "Guide to Tabular Presentation and Statistical Releases," in Board of Governors of the Federal Reserve System (U.S.), 1935- and Federal Reserve Board, 1914-1935. "May 1981," Federal Reserve Bulletin (May 1981) : 142-142. https://fraser.stlouisfed.org/title/62/item/20477/toc/104847 , accessed on April 23, 2024.