Encyclopedias, handbooks, and other sources for definitions, explanations, and historical background on your issue:
Documentaries can be useful to get some background on current issues related to your organization.
Books can be useful to get a deeper and broader perspective on your topic. (Trust me, skimming one book that has all the info you need can take way less time than putting together 20 shorter articles to try to understand the scope of your topic!)

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