United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "April 2011," PPI Detailed Report (April 2011) : 8-10. https://fraser.stlouisfed.org/title/63/item/21905/toc/90191 , accessed on July 11, 2024.
United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "April 2011," PPI Detailed Report (April 2011) : 8-10. https://fraser.stlouisfed.org/title/63/item/21905/toc/90191 , accessed on July 11, 2024.