You can use the search box in Wikipedia, but also in general search engines such as Google Wikipedia articles appear in the list of results.
Basic search method in Wikipedia:
You can perform an advanced search via portal contents.
If you want to find all pages with your search term(s) and not just the page containing your term(s) as exact title, add a tilde (~) to your query (it does not matter where).
Wikipedia has a page with advanced search options, for instance the talk pages, overview pages (portals) or pages about registered Wikipedia users.
If Wikipedia does not have an article with the exact terms in the title, you will be shown results which have the terms in the text.
Still not found what you are looking for? Try to:
As a rule you are allowed to cite anything you want, but there are two conditions:
However, in science citing reference works such as encyclopedias is not a common practice. Exceptions to this rule are:
if there is no other source available (but in the case of Wikipedia not very likely, because all articles should have source references);
Each Wikipedia article has a cite button in the left margin to generate a reference in a certain citation style.
Quality of Wikipedia as a whole
As to the quality of a language version of Wikipedia as a whole, Wikipedia has developed a standard: article depth:
Article depth mainly indicates the extent of collaboration on articles. It is closely connected to the size of the language area, but also to the culture of the Wikipedia community in that particular language area. It is clear that the Dutch Wikipedia has a greater need for article depth.
Quality of separate Wikipedia articles
For a quick impression of the quality of separate articles you could check:
Wat about Wikipedia's quality control?
Wikipedia is very useful in the exploratory phase of a research project. It is especially helpful in generating search terms. You can easily discover key concepts, related subjects, personal names and more.
Use Wikipedia to generate search terms by: