United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "April 2002," PPI Detailed Report (April 2002) : 9-11. https://fraser.stlouisfed.org/title/63/item/21799/toc/214229 , accessed on April 19, 2024.
United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "April 2002," PPI Detailed Report (April 2002) : 9-11. https://fraser.stlouisfed.org/title/63/item/21799/toc/214229 , accessed on April 19, 2024.