United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "December 1979," Business Conditions Digest (December 1979) : 2-2. https://fraser.stlouisfed.org/title/43/item/7400/toc/405540 , accessed on April 23, 2024.
United States. Bureau of the Census. "Title Page," in United States. Bureau of the Census. "December 1979," Business Conditions Digest (December 1979) : 2-2. https://fraser.stlouisfed.org/title/43/item/7400/toc/405540 , accessed on April 23, 2024.