Wikipedia is not a reliable source for citations elsewhere on Wikipedia. Because it can be edited by anyone at any time, any information it contains at a particular time could be vandalism, a work in progress, or just plain wrong. ... Therefore, Wikipedia should not be considered a definitive source in and of itself.

How much of Wikipedia is wrong?

The paper found that Wikipedia's entries had an overall accuracy rate of 80 percent, whereas the other encyclopedias had an accuracy rate of 95 to 96 percent. A 2010 study assessed the extent to which Wikipedia pages about the history of countries conformed to the site's policy of verifiability.

Why Wikipedia is a bad source?

However, citation of Wikipedia in research papers may be considered unacceptable, because Wikipedia is not a reliable source. ... This is because Wikipedia can be edited by anyone at any moment. Although when an error is recognized, it is usually fixed.