If you use an image you did not create, you must provide a citation. Image citations can be formatted according to the citation style you are using.
Image citations should include the following information:
If you found the image in a book, you will also need the author, title, publisher information, date, page, and figure or plate number of the reproduction. If you found the image online, you will need an access date, the web site address (URL), and, in some cases, an image ID number.