United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "March 2008," PPI Detailed Report (March 2008) : 2-3. https://fraser.stlouisfed.org/title/63/item/21868/toc/282780 , accessed on April 19, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "March 2008," PPI Detailed Report (March 2008) : 2-3. https://fraser.stlouisfed.org/title/63/item/21868/toc/282780 , accessed on April 19, 2024.