Regarding wikipedia policy on the use of sources:
- WP:NPOV: The policy requires that, where there are or have been conflicting views, these are fairly presented, but not asserted. All significant points of view are presented, not just the most popular one. It is not asserted that the most popular view or some sort of intermediate view among the different views is the correct one. Readers are left to form their own opinions.
- Feel free to read about Wikipedia:Guidelines for controversial articles: An article about a controversial person or group should accurately describe their views, no matter how misguided or repugnant. Remember to ask the question, "How can this controversy best be described?" It is not our job to edit Wikipedia so that it reflects our own idiosyncratic views and then defend those edits against all comers; it is our job to be fair to all sides of a controversy.
- The use of biased sources is allowed, Reliable sources: Do they have an agenda or conflict of interest, strong views, or other bias which may color their report? Remember that conflicts of interest are not always explicitly exposed and bias is not always self-evident. However, that a source has strong views is not necessarily a reason not to use it, although editors should avoid using political groups with widely acknowledged extremist views, like Stormfront.org or the Socialist Workers Party.
- Partisan sites are not excluded from use, Partisan websites: Partisan political and religious sources should be treated with caution, although political bias is not in itself a reason not to use a source.
- The use of legal experts seems to be encouraged, Beware false authority: Use sources who have postgraduate degrees or demonstrable published expertise in the field they are discussing. The more reputable ones are affiliated with academic institutions.
- Neutral language When a fact is not common knowledge, or when the information being related is a subjective assessment, like the result of a particular poll, the information should be attributed and cited.
- Balance An article can be written in neutral language and yet omit important points of view. Such an article should be considered an NPOV work in progress, not an irredeemable piece of propaganda. Often an author presents one POV because it's the only one that he or she knows well. The remedy is to add to the article—not to subtract from it.