Ask these questions to get a sense for whether your source is reliable:
- Ask who is responsible for the information.
Are they qualified to teach you? Why are they providing this information?
- Ask whether the information is objective.
Does it present both sides of an issue? Is it designed to persuade you? Does anything about the information seem fishy?
- Ask how current the information is.
Views of historical events change over time, and sometimes new sources are discovered. If you're using older sources, consider the context in which it was written, including the political and economic situation. Do newer sources offer any new insights? Do they use different primary sources?