United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "December 2007," PPI Detailed Report (December 2007) : 2-3. https://fraser.stlouisfed.org/title/63/item/21865/toc/254768 , accessed on May 10, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "December 2007," PPI Detailed Report (December 2007) : 2-3. https://fraser.stlouisfed.org/title/63/item/21865/toc/254768 , accessed on May 10, 2024.