United States. Bureau of Labor Statistics. "Price Movements," in United States. Bureau of Labor Statistics. "May 1978," PPI Detailed Report (May 1978) : 3-4. https://fraser.stlouisfed.org/title/63/item/21510/toc/180311 , accessed on April 25, 2024.
United States. Bureau of Labor Statistics. "Price Movements," in United States. Bureau of Labor Statistics. "May 1978," PPI Detailed Report (May 1978) : 3-4. https://fraser.stlouisfed.org/title/63/item/21510/toc/180311 , accessed on April 25, 2024.