I know most of us have some disbelief in this major web-encyclopedia, but, calm, don't overdo it! I can list some steps which you can follow to assure you're extracting a secure-source web material ; )
1 - Pay attention in the source(s) of the article(s);
First, look at if the article which you are acessing is provided by more than one source or not. If it has just one source, beware it cannot be a good option to extract informations from it to your school, college work;
2 - Verify the external