In general, images copied from elsewhere that are reproduced in
faculty/student papers or projects and which are available to only a
limited classroom or conference audience, fall within the scope of fair
use. Copies of images that are
made available for the public at large, for commercial purposes
(including publishing), or for an indefinite period of time usually
require copyright clearance. Permissions or waivers from the copyright
holder(s) and/or owners of the image(s) must be obtained. No matter
what the circumstance, images copied from elsewhere need to be properly
identified and cited.
The following links give examples of how to cite images from print and online sources.