United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "June 1997," PPI Detailed Report (June 1997) : 3-4. https://fraser.stlouisfed.org/title/63/item/21728/toc/86495 , accessed on May 7, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "June 1997," PPI Detailed Report (June 1997) : 3-4. https://fraser.stlouisfed.org/title/63/item/21728/toc/86495 , accessed on May 7, 2024.