Hilton III, John Levi, T. Jared Robinson, David Wiley, and J. Dale Ackerman. “Cost-Savings Achieved in Two Semesters through the Adoption of Open Educational Resources”. The International Review of Research in Open and Distributed Learning 15, no. 2 (April 1, 2014). Accessed May 25, 2024. https://www.irrodl.org/index.php/irrodl/article/view/1700.