United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "March 2009," PPI Detailed Report (March 2009) : 9-11. https://fraser.stlouisfed.org/title/63/item/21880/toc/229326 , accessed on March 28, 2024.
United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "March 2009," PPI Detailed Report (March 2009) : 9-11. https://fraser.stlouisfed.org/title/63/item/21880/toc/229326 , accessed on March 28, 2024.