United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "April 2006," PPI Detailed Report (April 2006) : 9-11. https://fraser.stlouisfed.org/title/63/item/21846/toc/285026 , accessed on April 25, 2024.
United States. Bureau of Labor Statistics. "Charts," in United States. Bureau of Labor Statistics. "April 2006," PPI Detailed Report (April 2006) : 9-11. https://fraser.stlouisfed.org/title/63/item/21846/toc/285026 , accessed on April 25, 2024.