Federal Reserve Bank of St. Louis. "General Price Indexes," in Federal Reserve Bank of St. Louis. "June 1968," National Economic Trends (June 1968) : 12-13. https://fraser.stlouisfed.org/title/870/item/34136/toc/81754 , accessed on April 19, 2024.
Federal Reserve Bank of St. Louis. "General Price Indexes," in Federal Reserve Bank of St. Louis. "June 1968," National Economic Trends (June 1968) : 12-13. https://fraser.stlouisfed.org/title/870/item/34136/toc/81754 , accessed on April 19, 2024.