This is intended to be a general guide for international research.
The best tip for researching international/global issues is to remember that it is multidiciplinary. Do not restrict yourself. For example, if you are looking for resources on the topic of "Human Rights" it might also be appropriate to look at the resources connected to "Health"; "Crime"; or "Terrorism." Or a research project on a broad global issue such as Economic Growth might start with reading articles on "microloans" which may lead the researcher to review the scholarship connected to a variety of subjects, for example, "Economics of Gender" or "agriculture" or "telecommunications."