Board of Governors of the Federal Reserve System (U.S.), 1935-. "Approval of application of Northern Trust Corporation to engage through subsidiary, Northern Investment Management Company, in providing investment advice as a commodity trader advisor on futures contracts" in Press Releases of the Board of Governors of the Federal Reserve System
(May 23, 1988).
https://fraser.stlouisfed.org/title/9237/item/691410, accessed on January 13, 2026.