United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "May 2012," PPI Detailed Report (May 2012) : 2-3. https://fraser.stlouisfed.org/title/63/item/21918/toc/422326 , accessed on April 25, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "May 2012," PPI Detailed Report (May 2012) : 2-3. https://fraser.stlouisfed.org/title/63/item/21918/toc/422326 , accessed on April 25, 2024.