Books & Journals
Give in parentheses the year the work was published.
Levy, S. (2011). In the plex: How Google thinks, works, and shapes our lives. Simon & Schuster.
If no date is available write (n.d.). in parentheses.
Heuristic. (n.d.). In Merriam-Webster’s online dictionary (11th ed.). http://www.m-w.com/dictionary/heuristic
Citation (“Heuristic,” n.d., para. 1).
Do not include retrieval dates unless the source material material may change over time (e.g., Wikis)
Bank Street College of Education (n.d.). In Wikipedia. Retrieved December 2, 2016, from https://en.wikipedia.org/wiki/Bank_Street_College_of_Education
Updated or Reviewed
If an online webpage has been clearly labeled as updated, use that date. Do not use a date that says reviewed (the content many not have been changed).
(American Psychological Association, 2020, pp. 289-291, 352)