United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "August 1988," PPI Detailed Report (August 1988) : 3-3. https://fraser.stlouisfed.org/title/63/item/21634/toc/352440 , accessed on May 4, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "August 1988," PPI Detailed Report (August 1988) : 3-3. https://fraser.stlouisfed.org/title/63/item/21634/toc/352440 , accessed on May 4, 2024.