United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "October 1997," PPI Detailed Report (October 1997) : 3-4. https://fraser.stlouisfed.org/title/63/item/21744/toc/190972 , accessed on April 25, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "October 1997," PPI Detailed Report (October 1997) : 3-4. https://fraser.stlouisfed.org/title/63/item/21744/toc/190972 , accessed on April 25, 2024.