United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "March 2009," PPI Detailed Report (March 2009) : 2-3. https://fraser.stlouisfed.org/title/63/item/21880/toc/229324 , accessed on April 23, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "March 2009," PPI Detailed Report (March 2009) : 2-3. https://fraser.stlouisfed.org/title/63/item/21880/toc/229324 , accessed on April 23, 2024.