This source provides reference articles on over 15,000 years of Native American culture and history, and includes biographies, legends, treaties, and more. Some primary sources are included.
To find a secondary source on Red Cloud, search for his name in the Library Catalog.
Once you find a book that looks like a good option, you can go into the stacks and check it out using your Blue Card. Simply ask a librarian for help if you're not sure how to find a book in the stacks.
Here is also a recommended eBook: