From the Section: Student Rights, Responsibilities, and Due Process:
4. Maintaining personal and academic integrity, thus contributing to the integrity of the College community. (p. 107)
A. Acts of dishonesty, including but not limited to the following: a. Cheating, plagiarism, or other forms of academic dishonesty. (p. 109)
8. Plagiarism: Using partially or totally the ideas or words of another person or persons in written assignments without crediting the source(s) of the ideas or words. (p. 113)
Plagiarize definition from Merriam-Webster.com:
Anything you state as a fact must be supported by literature or other forms of statistical data. However, there are certain facts that are so well known, there is no place to cite them. Be careful with common knowledge, however. As the APA blog demonstrates, even the most obvious fact may not be accurate.
Rule of thumb: if you can find the fact without citation in at least five reputable sources, it is probably common knowledge.
Not common knowledge:
When in doubt, cite it!
Courtesy Colorado Technical University.