Encyclopedias and other books in a library reference collection are excellent sources for general and detailed information on every conceivable subject.

Encyclopedias and statistical compilations provide impartial, unbiased, and factual information (Bias is a preference for a single position of a problem or issue). Symptoms of bias include:

• presenting arguments in an emotionally charged way;
• attacking the patriotism or morals of those who disagree;
• blatantly ignoring and/or dismissing the opposing side's valid arguments;
• purposely excluding minority viewpoints;
• advancing arguments without explaining them.

Biased information is easy to determine — there's no mention of the other side, or if there is, it's imcomplete, derogatory, or belittled.

Avoid using information containing bias — if you're not sure about a source (some people are very gifted and persuasive writers even if they're not ethical ones!), consult your instructor or librarian for help.