United States. Bureau of Labor Statistics. "Price Movements," in United States. Bureau of Labor Statistics. "June 1981," PPI Detailed Report (June 1981) : 5-7. https://fraser.stlouisfed.org/title/63/item/21547/toc/94166 , accessed on May 8, 2024.
United States. Bureau of Labor Statistics. "Price Movements," in United States. Bureau of Labor Statistics. "June 1981," PPI Detailed Report (June 1981) : 5-7. https://fraser.stlouisfed.org/title/63/item/21547/toc/94166 , accessed on May 8, 2024.