Business Cycle Reference Dates and Duration of Expansions and Contractions in the United States: 1854-1961
United States. Bureau of the Census. "Business Cycle Reference Dates and Duration of Expansions and Contractions in the United States: 1854-1961," in United States. Bureau of the Census. "April 1964," Business Conditions Digest (April 1964) : 69-69. https://fraser.stlouisfed.org/title/43/item/7202/toc/292479 , accessed on April 23, 2024.