To create an attribution for an openly licensed work that you want to incorporate into your course, you may find the acronym TASL helpful - Title, Author, Source, License.
Example:
Title - "Creative Commons 10th Birthday Celebration San Francisco“
Author - "Timothy Vollmer" - linked to his profile page
Source - "Creative Commons 10th Birthday Celebration San Francisco" - linked to original Flickr page
License - "CC BY 2.0" - linked to license deed
You can also use an attribution builder such as the Open Washington Attribution Builder. This will take you step by step and help you create an attribution using information from the OER.