United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "April 2013," PPI Detailed Report (April 2013) : 2-3. https://fraser.stlouisfed.org/title/63/item/21929/toc/68426 , accessed on March 28, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "April 2013," PPI Detailed Report (April 2013) : 2-3. https://fraser.stlouisfed.org/title/63/item/21929/toc/68426 , accessed on March 28, 2024.