Federal Reserve Bank of Philadelphia. "January 1967," Business Review (Federal Reserve Bank of Philadelphia) (January 1967). https://fraser.stlouisfed.org/title/5580/item/557459, accessed on April 19, 2024.
Federal Reserve Bank of Philadelphia. "January 1967," Business Review (Federal Reserve Bank of Philadelphia) (January 1967). https://fraser.stlouisfed.org/title/5580/item/557459, accessed on April 19, 2024.