United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "May 1979," PPI Detailed Report (May 1979) : 3-4. https://fraser.stlouisfed.org/title/63/item/21522/toc/404020 , accessed on March 28, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "May 1979," PPI Detailed Report (May 1979) : 3-4. https://fraser.stlouisfed.org/title/63/item/21522/toc/404020 , accessed on March 28, 2024.