If you quote from, paraphrase, or closely summarize your research sources, you need to use a footnote or endnote to tell readers where you found the information. This will assure readers that the source of your information is a credible one and enable them to find the source if they wish to.

Four types of statements must be footnoted:

• Direct quotations
• Unusual facts
• Controversial opinions
• Statements that serve as direct support for one of the main points of your paper

Beyond this rule, you must use your own judgment. Try to put yourself in the position of the average reader of your paper and ask, Will this reader have a question about or be surprised about what I have said? If you believe the answer to be yes, then it is best to footnote the information.