United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "May 2009," PPI Detailed Report (May 2009) : 11-13. https://fraser.stlouisfed.org/title/63/item/21884/toc/72441 , accessed on April 25, 2024.
United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "May 2009," PPI Detailed Report (May 2009) : 11-13. https://fraser.stlouisfed.org/title/63/item/21884/toc/72441 , accessed on April 25, 2024.