United States. Bureau of Economic Analysis. "Composite Indexes of Leading, Coincident, and Lagging Indicators: May 1979, BEA 79-44,"
Bureau of Economic Analysis (BEA) News Releases
(June 29, 1979).
https://fraser.stlouisfed.org/title/6148/item/595859, accessed on March 16, 2025.
@FedFRASER