United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "March 2011," PPI Detailed Report (March 2011) : 8-10. https://fraser.stlouisfed.org/title/63/item/21904/toc/416913 , accessed on May 2, 2024.
United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "March 2011," PPI Detailed Report (March 2011) : 8-10. https://fraser.stlouisfed.org/title/63/item/21904/toc/416913 , accessed on May 2, 2024.