Just like with text, there are rules guiding the reuse of media (photos and graphics, video, and audio). Media may be protected under copyright, meaning it may not be used without proper permission from the author or without following fair use. Whether you use copyright or public domain images, though, proper citation rules still apply. This webpage includes information on the ethical reuse of media, including understanding copyright, fair use, public domain media, and proper citation of media.
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Stock Images (Public Domain)
These images are free to reuse and alter without citation.
Creative Commons Images (Use may be restricted)
You can use these sources to find images, but you should check the permissions guidelines for each image. Unless otherwise indicated, images should be cited.