Federal Reserve Bank of Philadelphia. "January 1961," Business Review (Federal Reserve Bank of Philadelphia) (January 1961). https://fraser.stlouisfed.org/title/5580/item/557387, accessed on April 23, 2024.
Federal Reserve Bank of Philadelphia. "January 1961," Business Review (Federal Reserve Bank of Philadelphia) (January 1961). https://fraser.stlouisfed.org/title/5580/item/557387, accessed on April 23, 2024.