United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "October 1988," PPI Detailed Report (October 1988) : 3-3. https://fraser.stlouisfed.org/title/63/item/21635/toc/314706 , accessed on May 7, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "October 1988," PPI Detailed Report (October 1988) : 3-3. https://fraser.stlouisfed.org/title/63/item/21635/toc/314706 , accessed on May 7, 2024.