United States. Bureau of Labor Statistics. "Technical Notes," in United States. Bureau of Labor Statistics. "May 1993," PPI Detailed Report (May 1993) : 198-200. https://fraser.stlouisfed.org/title/63/item/21692/toc/76710 , accessed on May 10, 2024.
United States. Bureau of Labor Statistics. "Technical Notes," in United States. Bureau of Labor Statistics. "May 1993," PPI Detailed Report (May 1993) : 198-200. https://fraser.stlouisfed.org/title/63/item/21692/toc/76710 , accessed on May 10, 2024.