United States. Bureau of Labor Statistics. "Price Movements," in United States. Bureau of Labor Statistics. "May 2011," PPI Detailed Report (May 2011) : 4-7. https://fraser.stlouisfed.org/title/63/item/21906/toc/161955 , accessed on April 19, 2024.
United States. Bureau of Labor Statistics. "Price Movements," in United States. Bureau of Labor Statistics. "May 2011," PPI Detailed Report (May 2011) : 4-7. https://fraser.stlouisfed.org/title/63/item/21906/toc/161955 , accessed on April 19, 2024.