Open Educational Resources (OER) are teaching, learning, and research materials that reside in the public domain or have been released under an open license that permits their free use and re-purposing by others.
When you caption Creative Commons media (including images), you should include 4 major parts (TASL). You may need to modify the order or add more information based on the citation style you are using. Title: What is the name of the work? Author: Who allows you to use the work? Source: Where can people find the work? License: How can you use the work?