United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "January 2015," PPI Detailed Report (January 2015) : 46-49. https://fraser.stlouisfed.org/title/63/item/484518/toc/503250 , accessed on May 3, 2024.
United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "January 2015," PPI Detailed Report (January 2015) : 46-49. https://fraser.stlouisfed.org/title/63/item/484518/toc/503250 , accessed on May 3, 2024.