United States. Bureau of Economic Analysis. "Composite Indexes of Leading, Coincident, and Lagging Indicators: July 1978, BEA 78-67,"
Bureau of Economic Analysis (BEA) News Releases
(August 31, 1978).
https://fraser.stlouisfed.org/title/6148/item/595783, accessed on March 22, 2025.
@FedFRASER