Although each think tank claims and strives to be independent and
objective, you will notice as you read their materials
that they may have slight political biases.
It is up to you to be a critical reader.
You might also look at the part of each site that says about us
to get an idea of the organization's mission and leaders.
If you find one good article on your topic on a site, explore that site further.
It maybe an organization that focuses on your area of interest.
This site has sections on topics, regions, programs, experts, etc.
Each site may have its own search box as well.
I hope these tips for using the Google Scholar and
Harvard Think Tank search engine would help you enrich your studies.
Remember that there is also a document on your course site entitled For
Further Reading, and enjoy your explorations.