Imagine that you have this citation to a journal article, and you want to find the full text of the article.
Szwedo, D. E., Mikami, A. Y., & Allen, J. P. (2012). Social networking site use predicts changes in young adults' psychological adjustment. Journal of Research on Adolescence, 22, 453-466.
To find the article using WorldCat, go to the Advanced Search page and enter the article title in the Title box, and search. If the full-text is available you will see a link to the full-text on the results screen.