Answered By: Jackie Stevens
Last Updated: Jun 24, 2021     Views: 152

It depends on the style you are using. 

In AMA Style, you do need a retrieval date (known as an "accessed" date).

In APA Style, you do not need to include a retrieval date. 

In Chicago Footnotes, you would include a publication date or date of revision or modification. "If a date cannot be found include an access date in the first footnote and bibliography citations". 

Please see the links below for examples.