United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "July 1978," Business Conditions Digest (July 1978) : 16-17. https://fraser.stlouisfed.org/title/43/item/7383/toc/333751 , accessed on May 7, 2024.
United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "July 1978," Business Conditions Digest (July 1978) : 16-17. https://fraser.stlouisfed.org/title/43/item/7383/toc/333751 , accessed on May 7, 2024.