Federal Reserve Bank of Philadelphia. "September 1957," Business Review (Federal Reserve Bank of Philadelphia) (September 1957). https://fraser.stlouisfed.org/title/5580/item/557347, accessed on May 11, 2024.
Federal Reserve Bank of Philadelphia. "September 1957," Business Review (Federal Reserve Bank of Philadelphia) (September 1957). https://fraser.stlouisfed.org/title/5580/item/557347, accessed on May 11, 2024.