Second step: add the licence information at the end:
Add the licence information at the end of the regular citation. This is where you need to pay attention to the licence that comes with each image or video you choose to use, as knowing those symbols, e.g.CC BY SA, come in handy. Either use the acronyms, e.g.CC BY SA, or the text versions of the licence, e.g. CC Attribution - Share-Alike.
Add "Public Domain" for content in the public domain.
For content permitted for educational use, like Khan Academy videos, add a phrase such as "Educational use allowed" in place of the licence information.
Example of adding licence information for an IMAGE for the complete citation:
Claypool, Robert. “Flamingo.” Flickr, 5 Oct. 2012, flic.kr/p/dh7axD. CC BY 2.0.