United States. Bureau of the Census. "Stock Prices," in United States. Bureau of the Census. "April 1987," Business Conditions Digest (April 1987) : 102-102. https://fraser.stlouisfed.org/title/43/item/7488/toc/390629 , accessed on April 19, 2024.
United States. Bureau of the Census. "Stock Prices," in United States. Bureau of the Census. "April 1987," Business Conditions Digest (April 1987) : 102-102. https://fraser.stlouisfed.org/title/43/item/7488/toc/390629 , accessed on April 19, 2024.