United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "June 1999," PPI Detailed Report (June 1999) : 9-11. https://fraser.stlouisfed.org/title/63/item/21766/toc/367764 , accessed on April 18, 2024.
United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "June 1999," PPI Detailed Report (June 1999) : 9-11. https://fraser.stlouisfed.org/title/63/item/21766/toc/367764 , accessed on April 18, 2024.