TUS: Cite them right: Harvard Guide

Text below is taken from, Cite Them Right by Pears and Shields 12th ed (2022, p. 25):

Cite Them Right is not  intended to replace any departmental regulations, nor can it provide guidance to cover the full range of academic subjects its readers are studying. If you are unsure about how you should present illustrations in your academic work, you should ask your tutor for guidance.

If no guidance is available from your tutor we suggest that you number each illustration in the order they are used in your work, and provide a caption that describes the illustration, beginning the caption with 'Figure', then the number, then the description.

If you have used an illustration from someone else's work, conclude the caption with, in round brackets, Source: and the details of where the illustration came from. Include full details in the reference list.

If possible, and definitely if your work is going to be published, you should obtain written permission from the creator of the illustration to reuse their work.

Possible Example: Figure 2: Questions the Literature Review can Answer (Source: The Learning Centre, 2007, p.66)