United States. Bureau of Labor Statistics. "April 2003," PPI Detailed Report (April 2003). https://fraser.stlouisfed.org/title/63/item/21810, accessed on April 19, 2024.
United States. Bureau of Labor Statistics. "April 2003," PPI Detailed Report (April 2003). https://fraser.stlouisfed.org/title/63/item/21810, accessed on April 19, 2024.