United States. Bureau of Labor Statistics. "Producer Price Indexes by Durability of Product, Not Seasonally Adjusted," in United States. Bureau of Labor Statistics. "March 2010 (Corrected)," PPI Detailed Report (March 2010 (Corrected)) : 161-161. https://fraser.stlouisfed.org/title/63/item/21893/toc/116399 , accessed on March 28, 2024.