United States. Bureau of the Census. "Price Movements," in United States. Bureau of the Census. "April 1971," Business Conditions Digest (April 1971) : 60-61. https://fraser.stlouisfed.org/title/43/item/7553/toc/368672 , accessed on March 29, 2024.
United States. Bureau of the Census. "Price Movements," in United States. Bureau of the Census. "April 1971," Business Conditions Digest (April 1971) : 60-61. https://fraser.stlouisfed.org/title/43/item/7553/toc/368672 , accessed on March 29, 2024.