United States. Bureau of Labor Statistics. "Price Movements," in United States. Bureau of Labor Statistics. "July 1981," PPI Detailed Report (July 1981) : 5-7. https://fraser.stlouisfed.org/title/63/item/21548/toc/401635 , accessed on May 10, 2024.
United States. Bureau of Labor Statistics. "Price Movements," in United States. Bureau of Labor Statistics. "July 1981," PPI Detailed Report (July 1981) : 5-7. https://fraser.stlouisfed.org/title/63/item/21548/toc/401635 , accessed on May 10, 2024.