Federal Reserve Bank of Philadelphia. "October 1967," Business Review (Federal Reserve Bank of Philadelphia) (October 1967). https://fraser.stlouisfed.org/title/5580/item/557469, accessed on April 24, 2024.
Federal Reserve Bank of Philadelphia. "October 1967," Business Review (Federal Reserve Bank of Philadelphia) (October 1967). https://fraser.stlouisfed.org/title/5580/item/557469, accessed on April 24, 2024.