For those articles not in full text, you need to search the library catalog to see if your library owns a copy of that magazine or journal.

For example, if you were looking for this article:

"Gossip on the web: Truth, lies and cyberspace."
The Economist 351.8116 (April 24, 1999): 84.

You would search the library catalog for the title of the periodical (Economist), not the title of the article ("Gossip on the web: truth, lies and cyberspace").

Sometimes, you need more information beyond what you find in printed publications.  The Internet may be a good place to look.  So let's talk about using your search skills to get relevant information from the Internet.