United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "October 1987," PPI Detailed Report (October 1987) : 3-3. https://fraser.stlouisfed.org/title/63/item/21623/toc/226869 , accessed on April 23, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "October 1987," PPI Detailed Report (October 1987) : 3-3. https://fraser.stlouisfed.org/title/63/item/21623/toc/226869 , accessed on April 23, 2024.