A multi-institutional study of the impact of open textbook adoption on the learning outcomes of post-secondary students
In some educational settings, the cost of textbooks approaches or even exceeds the cost of tuition. Given limited resources, it is important to better understand the impacts of free open educational resources (OER) on student outcomes.
Fischer, L., Hilton, J., Robinson, T.J. et al. A multi-institutional study of the impact of open textbook adoption on the learning outcomes of post-secondary students. J Comput High Educ 27, 159–172 (2015). https://doi.org/10.1007/s12528-015-9101-x
The Battle for Open: How Openness Won and Why It Doesn't Feel Like A Victory by 
Interactive Open Educational Resources: : A Guide to Finding, Choosing, and Using What's Out There to Transform College Teaching by A Choice Outstanding Academic Title for 2014! Sponsored by the Association of College and Research Libraries (ACRL), this one-of-a-kind book demonstrates the best tools, resources, and techniques for discovering, selecting, and integrating interactive open educational resources (OERs) into the teaching and learning process. The author examines many of the best repositories and digital library websites for finding high quality materials, explaining in depth the best practices for effectively searching these repositories and the various methods for evaluating, selecting, and integrating the resources into the instructor's curriculum and course assignments, as well as the institution's learning management system.
Open Learning Cultures:A Guide to Quality, Evaluation, and Assessment for Future Learning by 
Paying the Price: College Costs, Financial Aid, and the Betrayal of the American Dream by 
The Pedagogy of the Open Society: Knowledge and the Governance of Higher Education by