United States. Bureau of Economic Analysis. "Composite Indexes of Leading, Coincident, and Lagging Indicators: September 1979, BEA 79-69,"
Bureau of Economic Analysis (BEA) News Releases
(October 30, 1979).
https://fraser.stlouisfed.org/title/6148/item/595887, accessed on March 22, 2025.
@FedFRASER