Why use articles for research?
As you review bibliographies, reference lists, etc., you will discover additional sources to possibly use.
Find them using the CitationLinker.
Now is the time to be more specific with your searching. Articles tend to cover very specific or niche topics, and are also published more quickly than books, meaning the information is typically more current than the general information you can gather from books.
Academic Search Ultimate offers access to an unprecedented collection of resources including journals, magazines, reports, books, and videos. Many are peer-reviewed and full-text. Subjects range from astronomy to zoology.
When you create keywords, you should also begin piecing together those keywords to create "search strings," or search strategies that can be used within the databases. By using boolean operators, nested searches and truncation, you can elevate and expand your searching in library resources.
It's one thing to be able to find sources for a paper, but it's another to be able to evaluate those sources and use them appropriately to support your research. For college-level research, you'll want to consider using only the highest-quality information sources that you can find. Review the guide for Critically Evaluating Sources to understand methods of evaluation.