Federal Reserve Bank of Dallas. "Rates for Discounts and Advances, Circular No. 81-92," District Notices (Federal Reserve Bank of Dallas) (May 4, 1981). https://fraser.stlouisfed.org/scribd/?item_id=541274&filepath=/files/docs/historical/frbdal/circulars/frbdallas_circ_19810504_no81-092.pdf&start_page=1, accessed on September 23, 2017.
Bulletin 2 Supplement A, Effective 5-5-81, Basic Rate Increased by 1% and Other Rates Accordingly.