Board of Governors of the Federal Reserve System (U.S.), 1935-. "Supervisory letter on effective internal credit rating systems : Release" in Press Releases of the Board of Governors of the Federal Reserve System
(September 21, 1998).
https://fraser.stlouisfed.org/title/9237/item/674616/content/pdf/frsbog_pr_19980921, accessed on March 5, 2026.