Yearbook of International Organizations
" ...since 1910, the Yearbook of International Organizations (has been the reference set that) provides the most extensive coverage of non-profit international organizations... Directly reflecting a dynamic international arena, it contains entries on 64587 civil society organizations in 300 countries and territories, in every field of human endeavour.
The Yearbook profiles international non-governmental (INGOs) and intergovernmental organizations (IGOs). There are all types of organizations, from formal structures to informal networks, from professional bodies to recreational clubs – regardless of ideology. However, it does not include for-profit enterprises." (emphasis added)