*For web sources, do page links lead to other sites or simply link to other pages on the same site?
Yes, there may be times when it is appropriate to use sources with a bias. For example, if you are writing an argumentative paper on a controversial topic, you will want to understand and present both sides of the issue. If you are using a biased source, it's a good idea to acknowledge that in your writing. Most importantly, you have to be able to recognize if your source is biased and if it is appropriate for your assignment. If you aren't sure, ask a librarian or your professor.