Why is "Retrieved from" included in the reference?

The words "Retrieved from" are not typically used in APA 7 references. However, there is an exception to this rule.

If the material being used is likely to be changed or updated over time, such as a blog post or wiki page, then the reference requires a Retrieval Date. According to Chapter 9 of the APA 7th Edition Publication Manual, when a Retrieval Date is included, the reference requires the addition of the words "Retrieved from" preceding the URL.

Example:

U.S. Census Bureau. (n.d.). U.S. and world population clock. U.S. Department of Commerce. Retrieved January 9, 2020, from https://www.census.gov/popclock/

You can also find this information on the APA Style Blog, the official blog of the APA, under "6. Webpage on a website with a retrieval date" at this link: https://apastyle.apa.org/style-grammar-guidelines/references/examples/webpage-website-references#6

In order to have PERRLA generate a reference without the words "Retrieved from," do not include a retrieval date when creating the reference.