I need to write a citation for an image -- this is not my paper, I'm just advising on the citation.
This image is the one that is being used.
Should I cite the book as the most important and like most stable source of the image, or just do the online image citation? Or, am I capturing the full provenance of an image: a retouched version of an image found online that came from this specific book?
I'm not so concerned with citation format (I'm using Medline), but making sure I think through the citation correctly for this scenario.