The research & publications of reputable think tanks, NGOs, and policy organisations, is often an important complement to academic literature (books and journal articles), especially for research topics that have policy dimensions relating to mental health, refugees, children, etc.
Especially useful are the main portals to the output of these organisations: Overton Policy Documents; Harvard Think Tank Search; Policy Commons
See also the links in the sections below to specialist organisations in each field (Children, Mental Health, etc.)
For details of UK government publications please see the Politics subject guide
For details of official publications from the UN and other international agencies see the Law subject guide and the Politics subject guide