A simple keyword searching using the Library's OneSearch discovery tool will bring you to a "research starter" article that provides a good foundational understanding of the internationality theory/concept.
OneSearch will also retrieve a range of sources about intersectionality, from books to journal and magazine articles, to news. Use the Advanced Search feature to focus your search on the aspects of intersectionality that interest you.
Want more help? Ask a Librarian!
Why should you do research in academic journals?
This explanation from Liverpool Hope University spells it out well: "Why use academic journals?"