Artistic works and images
There is no limit to the amount of an artistic work (including diagrams, maps and graphs) you can copy and communicate to students in unit sites and in class, provided the image is from a legal source.
All copies of images require a full bibliographic citation, and a Section 113P warning notice unless licensed by either Creative Commons, permission, subscription or terms of use.
You can also use images from the public domain, providing you attribute them.