United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "October 2009," PPI Detailed Report (October 2009) : 2-3. https://fraser.stlouisfed.org/title/63/item/21882/toc/389056 , accessed on April 25, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "October 2009," PPI Detailed Report (October 2009) : 2-3. https://fraser.stlouisfed.org/title/63/item/21882/toc/389056 , accessed on April 25, 2024.