Reading the bibliographies of a good article or book can be very helpful. But how do you find one of the sources listed?
If your citation looks something like the one below, then it's an article. (Hint: You know it's a journal article if you see volume/issue/page #s.)
Morrow, P. ‘‘Those Sick Challenger Jokes.’’ Journal of Popular Culture. 20.4 (1987): 175-84.
If your citation looks something like the one below, then it's a book. (Hint: You know it's a book if you see a city and a publisher/press)
Framing Monsters: Fantasy Film and Social Alienation; Bellin, Joshua David; 2005, Carbondale : Southern Illinois University Press.
i.e.: The search 'films AND psychology NOT children', will return a search with results that contain the keywords 'films' and 'psychology' but not 'children' - important if you are only looking at adolescent psychology in films.
i.e.: "college athletes" will return results with only that exact phrase.