Use the Non-governmental Organization Search Engine to search across NGO websites. Sites were chosen based on their consultative status with the United Nations Economic and Social Council (ECOSOC) and also collated from University of Minnesota Human Rights Library, Duke University Libraries' NGO Research Guide, and the World Association of Non-Governmental Organizations (WANGO).

Use the Intergovernmental Organization Search Engine (a Google custom search) to search across hundreds of IGO websites:

Citation databases allow you to see how often a work of scholarship is cited, and to trace connections between related works.

Yale Supported Databases

Portals are defined as web sites that serve as entry points to a number of separate information resources either within the same website or pointing out to other websites.