Federal Reserve Bank of Dallas. "Regulation G, T, and U, Circular No. 81-149," District Notices (Federal Reserve Bank of Dallas) (July 21, 1981). https://fraser.stlouisfed.org/scribd/?item_id=541331&filepath=/files/docs/historical/frbdal/circulars/frbdallas_circ_19810721_no81-149.pdf, accessed on March 22, 2018.
Federal Reserve Press Release 7-10-81, Invites Comments on 2nd Set of Proposed Amendments to Margin Regulations. Docket No. R-0362.