Both these libraries have a huge number of e-books and e-resources that you can use to research your assignments. You can join online and they will post you a library card!
Just like using any other information without referencing it, using images without permission is plagiarism. You can avoid plagiarising images by using the following sites:
After you search Google for images, click on "Tools" and select "Labelled for noncommercial reuse"
When you use an image in your assignment, it's important to list where it came from. Images are NOT listed in your bibliography. Follow the example below: