United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "October 1980," PPI Detailed Report (October 1980) : 3-3. https://fraser.stlouisfed.org/title/63/item/21539/toc/282634 , accessed on May 4, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "October 1980," PPI Detailed Report (October 1980) : 3-3. https://fraser.stlouisfed.org/title/63/item/21539/toc/282634 , accessed on May 4, 2024.