Bliss, T., Robinson, T. J., Hilton, J., & Wiley, D. A. (2013). An OER COUP: College Teacher and Student Perceptions of Open Educational Resources. Journal of Interactive Media in Education, 2013(1), Art. 4.
Hilton, J. Open educational resources, student efficacy, and user perceptions: a synthesis of research published between 2015 and 2018. Education Tech Research Dev 68, 853–876 (2020). https://doi.org/10.1007/s11423-019-09700-4
Analytic Reports from Bay View Analytics
Good running bibliographies for OER are compiled by librarians at the University of Maryland and the University of Toronto,