- General Assembly of Bizkaia
- General Assembly of Gipuzkoa
- General Assembly of Araba
- Department of Treasury and Finance of the Provincial Foral Government of Bizkaia
- Department of Treasury and Finance of the Provincial Foral Government of Gipuzkoa
- Department of Tresaury, Finance and Budget of the Provincial Foral Government of Araba
- Department of Economy and Finance of the Basque Government
- Arbitration Board of the Economic Agreement (Basque Government)
- Basque Tax Coordination Committee
- Basque Statistical Institute
- Institute of Public Economics (Basque Country University)
- Department of Treasury of the Government of Navarra
- Ministry of Finance and the Civil Service
- Coordination and Legislative Evaluation Committee
- Basque Arbitration Committee (AEAT)
- Spanish State Tax Agency (AEAT)
- Spanish Public Sector Economic Database
- Institute of Fiscal Studies (IEF)
- National Statistics Institute (INE)
- Barcelona Institute of Economics (IEB)
- National Securities Market Commission (CNMV)
- European Union Gateway
- EUROSTAT (European Union Statistical Service)
- International Monetary Fund (IMF)
- Organisation for Economic Cooperation and Development (OECD)
- International Bureau of Fiscal Documentation (IBFD)
- The Basque Economic Agreement: a personal approach (Pedro Luis Uriarte Santamarina)
- Basque Economic Agreement Community (Pedro Luis Uriarte Santamarina)
- EUTAX Observatory
- Economic and Financial Affairs Council (ECOFIN)