Oyadeyi, A. E., T. A. Oladokun, O. A. Shorunke, and O. S. Fasola. “Return on Investment (ROI) in Subscription Databases by Nigerian Academic Libraries: A Survey”. Folia Toruniensia, vol. 21, Nov. 2021, pp. 63-85, doi:10.12775/FT.2021.003.