United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "May 2006," PPI Detailed Report (May 2006) : 3-4. https://fraser.stlouisfed.org/title/63/item/21847/toc/236650 , accessed on April 25, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "May 2006," PPI Detailed Report (May 2006) : 3-4. https://fraser.stlouisfed.org/title/63/item/21847/toc/236650 , accessed on April 25, 2024.