[Commons-l] Credits in books

[Rama Rama]

An author has contacted me to use some of my photographs in a book (a
big, serious, scholarly, several-volume thing). He contacted me, and
several other users, after seeing images on Commons. Consequences:

1) Commons does get some visibility, and provides images to serious
work. Cheer up, people !

2) The author is enquiring how I wish to be credited. What do you
people think would be a concise yet effective way to mention Wikimedia
Commons in such cases ?

Cheers !
  -- Rama