United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "April 2012," PPI Detailed Report (April 2012) : 8-10. https://fraser.stlouisfed.org/title/63/item/21917/toc/377325 , accessed on May 13, 2024.
United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "April 2012," PPI Detailed Report (April 2012) : 8-10. https://fraser.stlouisfed.org/title/63/item/21917/toc/377325 , accessed on May 13, 2024.