In APA citation format, there need to include Retrieved Date. What does Retrieved mean? What date should I put?

The retrieved date is the date that you found and read an internet article.

http://www.library.vanderbilt.edu/peabody/research/APAquick2007.html

what about if it is a website? Is it the date i first visited that website?

Yes, although the date I'd record is the date I actually studied the site and took notes. In other words, you might bookmark several sites one day -- and actually read them carefully several days later -- discarding the sites that weren't useful to you. Use the date that you actually read and decide to use the site.

In APA citation format, the "retrieved date" refers to the date when you accessed an online source, such as a website, that may change or be updated over time. It is important to include this date to provide readers with a point of reference in case the content of the source changes or becomes unavailable.

The "retrieved date" should be the specific date when you accessed the source for your research. To find this date, follow these steps:

1. Open the online source you used for your research, such as a website article.
2. Look for information related to the publication or update date of the source. This information is usually found at the top or bottom of the page.
3. If you cannot find a publication or update date, look for a "last modified" or "last updated" date.
4. If none of these dates are available, use the date when you accessed the source as the "retrieved date".

Once you have obtained the specific date, format it in the APA citation as follows: "Retrieved Month Day, Year" (e.g., Retrieved August 26, 2021). Place this information at the end of the citation, after the URL or the digital object identifier (DOI), if applicable.

Remember that the "retrieved date" is only necessary for online sources that may change over time, and it is not required for print sources.