United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "March 1989," PPI Detailed Report (March 1989) : 3-4. https://fraser.stlouisfed.org/title/63/item/21643/toc/360373 , accessed on April 25, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "March 1989," PPI Detailed Report (March 1989) : 3-4. https://fraser.stlouisfed.org/title/63/item/21643/toc/360373 , accessed on April 25, 2024.