United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "April 1986," Business Conditions Digest (April 1986) : 66-66. https://fraser.stlouisfed.org/title/43/item/7476/toc/35669 , accessed on April 26, 2024.
United States. Bureau of the Census. "Composite Indexes," in United States. Bureau of the Census. "April 1986," Business Conditions Digest (April 1986) : 66-66. https://fraser.stlouisfed.org/title/43/item/7476/toc/35669 , accessed on April 26, 2024.