Images 2: Add Reference Details, Adjust Citations, and About Image Ideas
Graphical media should be referenced just as you would reference text sources and materials. This video also explains where to change citation display settings.
Open an Image Idea, then its 'References' tab. Add image citations with 'Add Ref.' button, just like text citations. Change image citation display settings in 'Edit', 'Document Settings...', and 'Image Refs'.