1. Agyen-Gyasi, K., Corletey, A. & Frempong, A. T. (2010). Open access institutional repositories: Issues and challenges. Proceedings of the Ghana Library Association AGM, KNUST, 2010, Ghana. Kumasi: GLA, 1–26.
2. Gold, green, and black open access
3. Open access versus subscription journals: a comparison of scientific impact
4. Chimah, J. N., Ugwoke, N. J. & Ogwo, U. (2015). Implementing Institutional Repositories in Nigerian Universities: Status, Challenges, Prospects, and Roles of Librarians and Libraries. International Journal of Applied Technologies in Library and Information Management, 1(1), 30–42.