No need to cite what is known as common knowledge.
But, what is common knowledge? Common knowledge includes information that someone can easily trace and find the answer to. In an academic context, common knowledge will depend on the audience, but here are some examples to get you started:
- There are 24 hours in a day.
- The President of the United States can serve up to two terms in office, each term lasting four years.
- The phone number for emergency services in the United States is 9-1-1
For more examples of how to determine if something is common knowledge, check out this resource: