Federal Reserve Bank of Philadelphia. "April 1968," Business Review (Federal Reserve Bank of Philadelphia) (April 1968). https://fraser.stlouisfed.org/title/5580/item/557475, accessed on April 25, 2024.
Federal Reserve Bank of Philadelphia. "April 1968," Business Review (Federal Reserve Bank of Philadelphia) (April 1968). https://fraser.stlouisfed.org/title/5580/item/557475, accessed on April 25, 2024.