United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "June 1978," Business Conditions Digest (June 1978) : 65-65. https://fraser.stlouisfed.org/title/43/item/7382/toc/110236 , accessed on April 23, 2024.
United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "June 1978," Business Conditions Digest (June 1978) : 65-65. https://fraser.stlouisfed.org/title/43/item/7382/toc/110236 , accessed on April 23, 2024.