Spencer, Chrissy, Aakanksha Angra, Kata Dósa, and Abigail Jones. “Undergraduate Learning Gains and Learning Efficiency in a Focused Open Education Resource”. The International Review of Research in Open and Distributed Learning 26, no. 2 (May 8, 2025): 184–204. Accessed April 3, 2026. https://www.irrodl.org/index.php/irrodl/article/view/8117.