Keep in mind that images and figures may be protected by copyright and that you may not be allowed to reproduce them in your work. Read more about images and copyright when publishing.
If you don't have permission to reproduce an image or figure you can always refer to it like any other source. The reader will then simply have to find the source to study the picture. If you want to refer to an image without reproducing it in your work you can follow the instructions below for the reference list entry. Just ignore the instructions for the caption, since you will not need one.
In the caption, under the image:
Image/Figure/Table X. Title of the image. From [number of the reference in your work, p. xx], reproduced with permission.
In the reference list:
Full reference to the source.
In the caption, under the image:
In the reference list:
If the license of an image states that attribution is required to use the image you must indicate the copyright holder in the reference list entry. The license is indicated in both the caption and the reference list entry. Most (but not all) images with a Creative Commons license require attribution.
In the example below the image of the puppy is taken from Wikimedia Commons and has a Creative Commons license (CC BY-SA 4.0). This license states that the image may be used freely but that attribution is required.
In the caption, under the image:
Image/Figure/Table X. Title of the image. From [Number of the reference in your work], License
In the reference list:
[#] X. Last name/Username, "Title of the image," Year. Accessed: Abbreviated month. Day, Year. [Electronic image]. Available: URL. License
In the caption, under the image:
In the reference list:
In the caption, under the image:
Image/Figure/Table X. Title of the image. From [number of the reference in your work], reproduced with permission.
In the reference list:
[#] X. Last name XX/Username, "Title of the image," Year. Accessed: Abbreviated month. Day, Year. [Electronic image]. Available: URL
In the caption, under the image:
In the reference list: