United States. Bureau of Labor Statistics. "Price Movements," in United States. Bureau of Labor Statistics. "April 2006," PPI Detailed Report (April 2006) : 5-8. https://fraser.stlouisfed.org/title/63/item/21846/toc/285025 , accessed on May 9, 2024.
United States. Bureau of Labor Statistics. "Price Movements," in United States. Bureau of Labor Statistics. "April 2006," PPI Detailed Report (April 2006) : 5-8. https://fraser.stlouisfed.org/title/63/item/21846/toc/285025 , accessed on May 9, 2024.