United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "April 2001," PPI Detailed Report (April 2001) : 9-11. https://fraser.stlouisfed.org/title/63/item/21786/toc/151484 , accessed on March 29, 2024.
United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "April 2001," PPI Detailed Report (April 2001) : 9-11. https://fraser.stlouisfed.org/title/63/item/21786/toc/151484 , accessed on March 29, 2024.