Isa, Mohammed Faisal, et al. “Design and Sizing of an Off-Grid Solar Photovoltaic (PV) System for an Office Unit at Modibbo Adama University, Yola-Nigeria”. Nigerian Journal of Physics, vol. 35, no. 4, July 2026, pp. 91-100, https://doi.org/10.62292/njp.v35i4.2026.630.