Federal Reserve Bank of Philadelphia. "January/February 1981," Business Review (Federal Reserve Bank of Philadelphia) (January/February 1981). https://fraser.stlouisfed.org/title/5580/item/557596, accessed on March 28, 2024.
Federal Reserve Bank of Philadelphia. "January/February 1981," Business Review (Federal Reserve Bank of Philadelphia) (January/February 1981). https://fraser.stlouisfed.org/title/5580/item/557596, accessed on March 28, 2024.