United States. Bureau of Labor Statistics. "September 1968," CPI Detailed Report (September 1968). https://fraser.stlouisfed.org/title/58/item/22150, accessed on April 19, 2024.
United States. Bureau of Labor Statistics. "September 1968," CPI Detailed Report (September 1968). https://fraser.stlouisfed.org/title/58/item/22150, accessed on April 19, 2024.