United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "February 2009," PPI Detailed Report (February 2009) : 8-10. https://fraser.stlouisfed.org/title/63/item/21881/toc/271116 , accessed on May 9, 2024.
United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "February 2009," PPI Detailed Report (February 2009) : 8-10. https://fraser.stlouisfed.org/title/63/item/21881/toc/271116 , accessed on May 9, 2024.