From: BCcampus. (2020). Open textbooks. Retrieved from https://open.bccampus.ca/open-textbook-101/
Open textbooks are textbooks licensed under an open copyright license and made available online to be freely used by students and instructors. They are available as online versions and in a variety of file formats (e.g., for eReaders, editable files like XML and HTML) and as low-cost printed versions. Open textbooks are a way to reduce student textbook costs and improve equal access to information while giving instructors the flexibility to create, reformat and customize their own course material. They are an affordable and alternative model to traditional textbooks. Some open textbooks even contain supplemental materials such as test banks, quizzes, PowerPoint slides and videos.
From: BCcampus. (2020). Open textbooks. Retrieved from https://open.bccampus.ca/open-textbook-101/
Open Access Content/Open Educational Resources in Academic Libraries Survey Report
SirsiDynix. (2020). Open Access Content/Open Educational Resources in Academic Libraries Survey Report. Library Journal. https://s3.amazonaws.com/ImageCloud/Research/Academic%20OA%20OER%20Survey%20Report%20FINAL.pdf
These OER repositories, while not an exhaustive listing, represent core repositories which are recommended to locate reliable, relevant and authoritative textbooks. It may be helpful to consult with a library staff for assistance in searching for and locating open textbooks.