Are you looking for a safe place for students to search for images to use in their academic work?
After Britannica Image Quest, check out Photos for Class! This is a great free resource for safe images that are licensed for school use. Best of all, each image comes with a built-in citation! Yes, the citation is literally part of the image when you download it. Look at the bottom of this image!
See more at: http://www.photosforclass.com.