United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "January 1999," PPI Detailed Report (January 1999) : 3-4. https://fraser.stlouisfed.org/title/63/item/21759/toc/62291 , accessed on April 18, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "January 1999," PPI Detailed Report (January 1999) : 3-4. https://fraser.stlouisfed.org/title/63/item/21759/toc/62291 , accessed on April 18, 2024.