United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "April 2015," PPI Detailed Report (April 2015) : 2-2. https://fraser.stlouisfed.org/title/63/item/494358/toc/505671 , accessed on April 18, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "April 2015," PPI Detailed Report (April 2015) : 2-2. https://fraser.stlouisfed.org/title/63/item/494358/toc/505671 , accessed on April 18, 2024.