United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "May 1992," PPI Detailed Report (May 1992) : 3-4. https://fraser.stlouisfed.org/title/63/item/21679/toc/350401 , accessed on May 8, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "May 1992," PPI Detailed Report (May 1992) : 3-4. https://fraser.stlouisfed.org/title/63/item/21679/toc/350401 , accessed on May 8, 2024.