The good news is that the majority of library research sources were already available online, and that hasn't changed. In particular, academic journal articles are almost exclusively online.
What has changed is that the library's print book collection is not accessible. Fortunately, more than half of the library's books are available as ebooks, and the book resources listed below will direct you to the best ways to locate them.
Many of our databases use specific terminology for concepts around migration. Consider trying some of these terms if you're searching on this subject:
If you need basic background information on a topic (the kind of information you might think to go to Wikipedia for), please take a look at our academic encyclopedias.
You can find more academic encyclopeidas here.