The date refers to when the work was published, whether in print or online. Most commonly, it is the just the year, but can include the month or day, as shown below. The date is enclosed in parentheses and followed by a period. Some articles found on the web do not have dates. In those cases, put (n.d.) for “no date” as the date of the source.

American Psychological Association. (2020).

Chang, H.-H., & Wong, K.-H. (2010).

Dean, W. (n.d.). 

Denning, P. J. (2017).

Kafai, Y., & Resnick, M. (1996).