For your third article you will find the list of references at the end of either your first article or your second article and search through them to find another primary source article that is on the same topic as the other two.
The easiest way to find the full text of the article is to use the Library Search box and type the article title into the box.
In newer articles, there may be live doi links. If so, these will take you to the full text of the article.
If there is no doi link, search the title of the article in Library Search
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