Google has started to include Wikipedia articles in its OneBox results. All you are required to do is only add some information to your query and Google will return links to Wikipedia on top search results. But the searchers are also required to give exactly same Wikipedia article title and search keyword otherwise there will be no Onebox links. Onebox of Google shows special results like weather, music, news, maps and stock quotes by some particular keywords. Very recently, blogs were also added as a part of results.