United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "August 2011," PPI Detailed Report (August 2011) : 2-3. https://fraser.stlouisfed.org/title/63/item/21909/toc/176378 , accessed on April 24, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "August 2011," PPI Detailed Report (August 2011) : 2-3. https://fraser.stlouisfed.org/title/63/item/21909/toc/176378 , accessed on April 24, 2024.