Elemi, E. D., P. O. Ukatu, G. F. Uwak, and L. J. Agah. “Effect of Nitrogen, Phosphorus and Variety on Physiological Indices and Nutrient Composition of Livingstone Potato (Plectranthus Esculentus N.E.Br.) in Gombe, Northern Guinea Savannah, Nigeria”. Journal of Experimental Agriculture International, Vol. 43, no. 11, Dec. 2021, pp. 180-8, doi:10.9734/jeai/2021/v43i1130770.