Nuhu, Ahmed Khadiy, et Jafaru Shinkafi Aliyu. « Fee-Based Electronic Information Services and Effective Service Delivery by Federal University Libraries in Nigeria ». Ghana Library Journal (ISSN: 3134-5522), vol. 27, nᵒ 1, juillet 2022, p. 93-103, https://doi.org/10.4314/glj.v27i1.8.