United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "March 1988," PPI Detailed Report (March 1988) : 3-3. https://fraser.stlouisfed.org/title/63/item/21628/toc/410026 , accessed on May 4, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "March 1988," PPI Detailed Report (March 1988) : 3-3. https://fraser.stlouisfed.org/title/63/item/21628/toc/410026 , accessed on May 4, 2024.