United States. Bureau of Labor Statistics. "Technical Note," in United States. Bureau of Labor Statistics. "May 2006," PPI Detailed Report (May 2006) : 141-145. https://fraser.stlouisfed.org/title/63/item/21847/toc/236662 , accessed on May 4, 2024.
United States. Bureau of Labor Statistics. "Technical Note," in United States. Bureau of Labor Statistics. "May 2006," PPI Detailed Report (May 2006) : 141-145. https://fraser.stlouisfed.org/title/63/item/21847/toc/236662 , accessed on May 4, 2024.