United States. Bureau of the Census. "Stock Prices," in United States. Bureau of the Census. "April 1981," Business Conditions Digest (April 1981) : 102-102. https://fraser.stlouisfed.org/title/43/item/7416/toc/419177 , accessed on July 15, 2024.
United States. Bureau of the Census. "Stock Prices," in United States. Bureau of the Census. "April 1981," Business Conditions Digest (April 1981) : 102-102. https://fraser.stlouisfed.org/title/43/item/7416/toc/419177 , accessed on July 15, 2024.