United States. Bureau of the Census. "Stock Prices," in United States. Bureau of the Census. "July 1981," Business Conditions Digest (July 1981) : 102-102. https://fraser.stlouisfed.org/title/43/item/7419/toc/226093 , accessed on April 18, 2024.
United States. Bureau of the Census. "Stock Prices," in United States. Bureau of the Census. "July 1981," Business Conditions Digest (July 1981) : 102-102. https://fraser.stlouisfed.org/title/43/item/7419/toc/226093 , accessed on April 18, 2024.