Wansah, J. F., A. Achimugu, and M. O. Omopekunola. “Estimation of Reference Evapotranspiration of Ussa, Taraba State”. Nigerian Journal of Physics, vol. 32, no. 1, July 2023, pp. 60-66, https://njp.nipngr.org/index.php/njp/article/view/25.