United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "April 2002," PPI Detailed Report (April 2002) : 3-4. https://fraser.stlouisfed.org/title/63/item/21799/toc/214230 , accessed on April 19, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "April 2002," PPI Detailed Report (April 2002) : 3-4. https://fraser.stlouisfed.org/title/63/item/21799/toc/214230 , accessed on April 19, 2024.