United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "April 2007," PPI Detailed Report (April 2007) : 1-2. https://fraser.stlouisfed.org/title/63/item/21853/toc/404073 , accessed on April 26, 2024.
United States. Bureau of Labor Statistics. "Contents," in United States. Bureau of Labor Statistics. "April 2007," PPI Detailed Report (April 2007) : 1-2. https://fraser.stlouisfed.org/title/63/item/21853/toc/404073 , accessed on April 26, 2024.