Every time you use an image, photograph, graph, map or illustration in your writing, it may be referred to up to three times:
1. Figures and Captions: In a caption under the image.
2. In-text citation: In your writing with an in-text citation.
3. Reference List or List of Illustrations: If you have only used a few images, include them in same Reference List as your books, articles, etc. If you have a large number of images in your dissertation or thesis, you should reference them in a separate List of Illustrations or List of Figures.