United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "April 2011," PPI Detailed Report (April 2011) : 2-3. https://fraser.stlouisfed.org/title/63/item/21905/toc/90189 , accessed on April 19, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "April 2011," PPI Detailed Report (April 2011) : 2-3. https://fraser.stlouisfed.org/title/63/item/21905/toc/90189 , accessed on April 19, 2024.