United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "December 1998," PPI Detailed Report (December 1998) : 3-4. https://fraser.stlouisfed.org/title/63/item/21758/toc/156815 , accessed on May 1, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "December 1998," PPI Detailed Report (December 1998) : 3-4. https://fraser.stlouisfed.org/title/63/item/21758/toc/156815 , accessed on May 1, 2024.