How to credit a photo taken by someone else in my publication?
Credit lines for photographs should be displayed conspicuously with the photo or in a footnote on the same page. In general, it should look something like: "© Ansel Adams 2015" or "© 2015 Ansel Adams". Alternatively, if the photo was given to you for general use, use something like: "photo courtesy of Ansel Adams".

Some guidelines for citing images in various formats are posted here: University of Cincinnati. Near the bottom of that website there is a short section with advice on photo credit lines.