To evaluate source credibility, researchers consider not only an author’s reputation in the field, but equally whether he or she cites sources. These two commonly (but not always) go hand in hand: generally, authors respected in their fields are responsible and cite sources. (In popular fields, some individuals gain favorable reputations without responsible scholarship. This is less common in rigorous academic fields.) In some rapidly changing fields, e.g., information technologies, sources must be current; in others, e.g., nineteenth-century American history (barring new historical discoveries), information published decades ago may still be accurate. Researchers must consider author point of view and purpose, which affect neutrality. Sources from certain points of view can be credible but may restrict subject treatment to one side of a debate. Audience values influence what they consider credible: younger readers accept internet sources more, academics value refereed journals, and local community residents may value mainstream sources such as Newsweek magazine.