Use Scholarly Books and Articles to flesh out your briefing. Look for answers to questions such as:
Books are a great place to get a wide range of knowledge about a country or area. They can provide background, analysis, data, and more.
Google Scholar is a great resource for finding scholarly resources. It is also a great place to check for the full-text of an article before submitting an ILL request.
Newspapers will add life to your briefing through reporting of current events, elections, debates, policies, etc.