United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "July 1980," PPI Detailed Report (July 1980) : 3-3. https://fraser.stlouisfed.org/title/63/item/21536/toc/216433 , accessed on April 18, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "July 1980," PPI Detailed Report (July 1980) : 3-3. https://fraser.stlouisfed.org/title/63/item/21536/toc/216433 , accessed on April 18, 2024.