I have found many questions about "attribution" of work in SE but not specifically about this issue.
I've found a book published on paper using many images coming from "Wikipedia". At the end of the book a single page contains all the credits for the numerous images used in the book. This page has a "section" titled "Wikipedia" and the list of locations where images from Wikipedia have been used (and only that). No attribution or copyright notice is given beyond the fact that the photos are listed in that section. No reference about any licence is given, neither hyper link, etc.
I was wondering if it was a proper attribution of photographies with Creative Common Licences.
I have checked one of the photos. It was not a public domain photo and has not been modified by the publisher of the book. On the Wikimedia - not "Wikipedia" - page corresponding to that photo, the licence is a "Creative Common Attribution Share Alike 3.0 Unported". If I understand well, the author should have been credited, unless they explicitly requested the inverse. Meanwhile there is a notion of flexibility in attribution. I refer in particular to the following statement from the licence:
You may satisfy the conditions in (1) and (2) above in any reasonable manner based on the medium, means and context in which the Licensed Material is used.
I understand that printing more pages would make the book more expensive, and putting the attribution for each photo used would add a lot of text to this page. Although I am still wondering. Assuming that the author is not aware of the use of the photograph, is it a legal use of the photos or should the attributions be more precise?
Update: Yes some photos are just plain reproductions of the paintings which means they are public domain. Other are not. I have contacted two of the authors so far. The task of identifying them is rather daunting. One of them answered. They told me to contact the publisher myself. I don't think that's my role as I am not the author and this is already taking me a lot of time. I will try to contact other authors. One issue is that messaging on Wikicommons or Wikipedia is not private (unless the user has set an email address to receive messages and only for Wikipedia). I'd rather not give the title or even the ISBN publicly. So trying to contacting the author privately is an issue.