table 1 - sources 1&2
table 2 - Sources 1&3
table 3 - Sources 3&4
table 4 - Sources 2&5
To do on your own: Open your sources and skim them for just a couple of minutes - you won't be able to really read them, but try to get an idea of what kind of source you're looking at. Use Google if you need to to help you find out more about the source. Notice the structure of the article and any characteristics about the article that you want to discuss with your group.
Then, talk about the following at your table (be ready to discuss with the larger group):
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