Federal Reserve Bank of Dallas. "Revised Supplement B to Bulletin 4, Circular No. 79-212," District Notices (Federal Reserve Bank of Dallas) (December 20, 1979). https://fraser.stlouisfed.org/scribd/?item_id=542802&filepath=/files/docs/historical/frbdal/circulars/frbdallas_circ_19791220_no79-212.pdf&start_page=1, accessed on October 22, 2017.
Bulletin 4 Revised Supplement B for 1980. Current Schedule of Base and Related Reserve Periods.