During your college career your instructors will expect you to find "scholarly" articles. What does that mean? It means that now that you are in college you need to use academic resources for your papers and projects.
Try this "Anatomy of a Scholarly Article" for more information on how to identify a scholarly article.
Scholarly resources have been reviewed by experts to see if they are worthwhile or not.
Plus it is important to evaluate those resources that you do find. Everything is not equally great. You need to use only the best sources for your paper--the better the sources the better the paper, and the easier to write too!
Science Select allows you to limit your search to peer-reviewed full-text articles.
Google Scholar allows you to limit your search to peer-reviewed full-text articles.
When searching for a topic remember to combine your main ideas with the word AND. This will retrieve all of the articles that contain both words.
The AND word will narrow your results so that you have 27 articles to view instead of 27 million! A handy tool.