- CEPAL – http://www.cepal.org – Comissão Econômica para a América Latina e o Caribe
- FMI – http://www.imf.org – Fundo Monetário Internacional
- IBFD – http://www.ibfd.org – International Bureau of Fiscal Documentation
- ITDWeb – http://www.itdweb.org – International Tax Dialogue
- OECD – http://www.oecd.org – Organization for Economic Co-operation and Development
- IOTA – http://www.iota-tax.org – Intra-European Organization of Tax Administrations
- EC-Taxation and Customs – http://ec.europa.eu/taxation_customs/taxation/index_en.htm – European Commission – Taxation and Customs Union
- IEF – http://www.ief.es – Instituto de Estudios Fiscales – Espanha
- BNA – http://www.bna.com – Bureau of National Affairs- USA
- IRS – http://www.taxsos.com/irstaxpublications.htm – IRS Tax Publications
- IFS – http://www.ifs.org.uk/ – Institute for Fiscal Studies
- NTA – http://www.ntanet.org – National Tax Association
- International Tax Review – http://www.internationaltaxreview.com – International taxation studies