United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "January 1980," PPI Detailed Report (January 1980) : 3-3. https://fraser.stlouisfed.org/title/63/item/21530/toc/269680 , accessed on April 23, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "January 1980," PPI Detailed Report (January 1980) : 3-3. https://fraser.stlouisfed.org/title/63/item/21530/toc/269680 , accessed on April 23, 2024.