(Source: Academic Integrity at MIT, 2020)
Common knowledge is information that is accepted as reliable and widely known by the average, educated person and generally does not require citation, including:
Keep in mind that not all information is widely known across academic disciplines, cultures or national groups, so when in doubt, cite.
Ask these key questions:
Who is my designated audience?
What is their pre-existing knowledge of the topic?
Will I be asked where I obtained my information?