You must cite when:
- You use or quote another author's words
- You paraphrase or summarize an idea
- You reuse an image, diagram, or chart
You do not need to cite the source if information being used is common knowledge. For example:
- George Washington was the first president.
- There are seven days in the week.
- Abraham Lincoln's face is on the penny.
When in doubt, it is best to cite the source from where the information came.