United States. Bureau of the Census. "Analytical Ratios," in United States. Bureau of the Census. "June 1973," Business Conditions Digest (June 1973) : 102-102. https://fraser.stlouisfed.org/title/43/item/7322/toc/166922 , accessed on May 13, 2024.
United States. Bureau of the Census. "Analytical Ratios," in United States. Bureau of the Census. "June 1973," Business Conditions Digest (June 1973) : 102-102. https://fraser.stlouisfed.org/title/43/item/7322/toc/166922 , accessed on May 13, 2024.