How do you reference a date?
For most references, it’s pretty straightforward: The date element is the year of publication, found on the copyright page (for books) or the first page of the article (for journals); put it in parentheses and follow with a period.
How do you write a date in a paper?
In formal writing, always write the date in full when it is part of a sentence. This usually involves giving the day of the month, the month, and the year: The meeting will take place on April 21, 2019. Note that the year follows after a comma.