United States. General Accounting Office and United States. Government Accountability Office. "Payment Services : Federal Reserve's Competition with Other Providers Benefits Customers, but Additional Reviews Could Increase Assurance of Cost Accuracy, Report to the Chairman, Committee on Financial Services, House of Representatives" in Selected GAO Reports & Testimonies (August 30, 2016). https://fraser.stlouisfed.org/title/6136/item/622276, accessed on May 22, 2026.