United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "August 2009," PPI Detailed Report (August 2009) : 2-3. https://fraser.stlouisfed.org/title/63/item/21886/toc/402665 , accessed on May 7, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "August 2009," PPI Detailed Report (August 2009) : 2-3. https://fraser.stlouisfed.org/title/63/item/21886/toc/402665 , accessed on May 7, 2024.