United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "March 2012," PPI Detailed Report (March 2012) : 2-3. https://fraser.stlouisfed.org/title/63/item/21916/toc/41090 , accessed on March 28, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "March 2012," PPI Detailed Report (March 2012) : 2-3. https://fraser.stlouisfed.org/title/63/item/21916/toc/41090 , accessed on March 28, 2024.