If the database you're searching doesn't seem to have the full text of the article attached, try these steps:
Many databases now offer some kind of cited reference search.
Web of Science remains the granddaddy of these.
A number of EBSCOhost databases, like Academic Search Premier, offer citation searching - look for the "Cited References" tab near the top of the search page.
Other databases, such as Sociological Abstracts, and PsycInfo may provide a "cited by" link for newer citations. And Google Scholar, however imperfectly, also links to cited by records.
And CiteSeerX, which pioneered autonomous citation indexing, also includes a "cited by" link.