United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "May 2008," PPI Detailed Report (May 2008) : 2-3. https://fraser.stlouisfed.org/title/63/item/21870/toc/63147 , accessed on April 25, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "May 2008," PPI Detailed Report (May 2008) : 2-3. https://fraser.stlouisfed.org/title/63/item/21870/toc/63147 , accessed on April 25, 2024.