When using the internet you should be cautious as most websites don't undergo peer review. You need to evaluate the website: is it reliable? is it up to date? is it credible?
The following links will help you find out more about evaluating websites:
Databases are vast searchable collections of records describing journal articles and other documents such as conference papers, reports, and book chapters. They are produced commercially or by learned societies, and most of them are international in scope, thus enabling you to explore the world's literature in a particular field. When you search a large international database, the articles you discover may, or may not, be available in UCT Libraries. Most databases provide abstracts (or summaries) of the articles' content, and some provide the full text of the articles themselves. When full text is not part of the database, our link resolver software, SFX, will help you track down the full article if it is available in any of our e-journal packages.