I never use Wikipedia textual information at all, because of the large number of errors included in those articles. In fact, many colleges and Universities do not permit use of its information in assignments. Many departments at The Ohio State University, for instance, and other colleges in my city take action against students who use Wikipedia.
I use some images from Wikipedia and even then I have found some "public domain" images there that were actually copyrighted and not to be used without written permission (I was contacted by the legal owners of the images when I used them and had to take the images down).
Otherwise, for any non-HubPages links, you are allowed to have two (2) only from any single domain per Hub.