United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "April 2001," PPI Detailed Report (April 2001) : 3-4. https://fraser.stlouisfed.org/title/63/item/21786/toc/151485 , accessed on April 25, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "April 2001," PPI Detailed Report (April 2001) : 3-4. https://fraser.stlouisfed.org/title/63/item/21786/toc/151485 , accessed on April 25, 2024.