United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "January 2009," PPI Detailed Report (January 2009) : 2-3. https://fraser.stlouisfed.org/title/63/item/21879/toc/375469 , accessed on April 23, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "January 2009," PPI Detailed Report (January 2009) : 2-3. https://fraser.stlouisfed.org/title/63/item/21879/toc/375469 , accessed on April 23, 2024.