Federal Reserve Bank of Dallas. "Routing Number Policy, Circular No. 81-129," District Notices (Federal Reserve Bank of Dallas) (July 1, 1981). https://fraser.stlouisfed.org/title/5569/item/541311, accessed on August 21, 2018.
Bulletin 8 Related. Regarding Assignments of Routing Number Policy. Review Completed and Action to Taken in All Federal Reserve Districts.