Researching international human rights law can be a confusing mess of treaties and documents. The materials (for the most part) are not set out in a coherent, well organized fashion. The sources of information range from recognized treaty law to more ephemeral materials from non-governmental organizations. There are a few things to keep in mind when doing human rights research:
The researcher needs to be resourceful, creative, and never become daunted by the task. Just when you are ready to give up is when you might find the needed material.
These sources are good starting points for general human rights research and to get some familiarity with various sources for this topic.
There are many such legal research guides available on the web. To locate more, do a Google search for your topic and the works "research guide." For example, African human rights research guide.
Subject-specific Encyclopedias & Dictionaries:
Handbooks & Commentaries: