United States. Bureau of Labor Statistics. "April 1999," CPI Detailed Report (April 1999). https://fraser.stlouisfed.org/title/58/item/19499, accessed on May 9, 2024.
United States. Bureau of Labor Statistics. "April 1999," CPI Detailed Report (April 1999). https://fraser.stlouisfed.org/title/58/item/19499, accessed on May 9, 2024.