United States. Bureau of Labor Statistics. "Price Movements," in United States. Bureau of Labor Statistics. "May 1990," PPI Detailed Report (May 1990) : 5-7. https://fraser.stlouisfed.org/title/63/item/21657/toc/176322 , accessed on June 22, 2024.
United States. Bureau of Labor Statistics. "Price Movements," in United States. Bureau of Labor Statistics. "May 1990," PPI Detailed Report (May 1990) : 5-7. https://fraser.stlouisfed.org/title/63/item/21657/toc/176322 , accessed on June 22, 2024.