Citations for OER materials are known as ATTRIBUTIONS.
The CC license allows educational use as long as the content is properly cited. Check the following wiki article on how to create your own attribution for materials using Creative Commons licenses.
Create your citation using the APA style, and then add the CC or public domain license info at the end of your citation.
Examples of APA citation:
Authors. (year). Title. Retrieved from URL. CC BY-NC-SA 4.0 license.
Author. (year, month day). Title [Video file]. Retrieved from URL. CC BY-NC 4.0 license.
Authors. (year, month day example: 2021, December 20). Title [Photograph]. Retrieved from URL. CC BY 2.0 license.