United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "March 1999," PPI Detailed Report (March 1999) : 3-4. https://fraser.stlouisfed.org/title/63/item/21762/toc/114833 , accessed on April 19, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "March 1999," PPI Detailed Report (March 1999) : 3-4. https://fraser.stlouisfed.org/title/63/item/21762/toc/114833 , accessed on April 19, 2024.