Federal Reserve Bank of Chicago. "January 1971 : Review and Outlook - 1970-71," Business Conditions (Federal Reserve Bank of Chicago) (January 1971). https://fraser.stlouisfed.org/title/5562/item/540295, accessed on April 18, 2024.
Federal Reserve Bank of Chicago. "January 1971 : Review and Outlook - 1970-71," Business Conditions (Federal Reserve Bank of Chicago) (January 1971). https://fraser.stlouisfed.org/title/5562/item/540295, accessed on April 18, 2024.