United States. Bureau of the Census. "Price Movements," in United States. Bureau of the Census. "April 1981," Business Conditions Digest (April 1981) : 90-92. https://fraser.stlouisfed.org/title/43/item/7416/toc/419170 , accessed on July 15, 2024.
United States. Bureau of the Census. "Price Movements," in United States. Bureau of the Census. "April 1981," Business Conditions Digest (April 1981) : 90-92. https://fraser.stlouisfed.org/title/43/item/7416/toc/419170 , accessed on July 15, 2024.