Bopp, Karl R. (Karl Richard), 1906-1979. "Leaning Against the Winds of Change," in Federal Reserve Bank of Philadelphia. "June 1963," Business Review (Federal Reserve Bank of Philadelphia) (June 1963) : 3-10. https://fraser.stlouisfed.org/title/5580/item/557416/toc/523072 , accessed on April 24, 2024.