United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "April 1979," PPI Detailed Report (April 1979) : 3-3. https://fraser.stlouisfed.org/title/63/item/21521/toc/417543 , accessed on April 25, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "April 1979," PPI Detailed Report (April 1979) : 3-3. https://fraser.stlouisfed.org/title/63/item/21521/toc/417543 , accessed on April 25, 2024.