Sometimes your instructors will give you a list of articles that want you to track down and read. Or maybe you looked at the reference list in a book or article you are using and want to track down some of the articles cited.
In either case, a good way to find those articles is through Google Scholar.
Let's try to find the below article citation from the book we're reading!
Loic Wacquant, "America's New 'Peculiar Institution': On the Prison as Surrogate Ghetto," Theoretical Criminology 4, no. 3 (2000): 380.