United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "June 1978," PPI Detailed Report (June 1978) : 2-2. https://fraser.stlouisfed.org/title/63/item/21511/toc/345732 , accessed on April 23, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "June 1978," PPI Detailed Report (June 1978) : 2-2. https://fraser.stlouisfed.org/title/63/item/21511/toc/345732 , accessed on April 23, 2024.