United States. Bureau of Labor Statistics. "Technical Notes," in United States. Bureau of Labor Statistics. "May 2002," PPI Detailed Report (May 2002) : 169-173. https://fraser.stlouisfed.org/title/63/item/21800/toc/63002 , accessed on May 10, 2024.
United States. Bureau of Labor Statistics. "Technical Notes," in United States. Bureau of Labor Statistics. "May 2002," PPI Detailed Report (May 2002) : 169-173. https://fraser.stlouisfed.org/title/63/item/21800/toc/63002 , accessed on May 10, 2024.