United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "July 1978," PPI Detailed Report (July 1978) : 3-3. https://fraser.stlouisfed.org/title/63/item/21512/toc/135828 , accessed on April 19, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "July 1978," PPI Detailed Report (July 1978) : 3-3. https://fraser.stlouisfed.org/title/63/item/21512/toc/135828 , accessed on April 19, 2024.