"Evaluation of the Concentrations of Nitrate, Nitrite and Heavy Metals in Spinach (Spinacia oleracea) Irrigated Along the Amba Stream Lafia, Nasarawa State". Lafia Journal of Scientific and Industrial Research, م 2, عدد 1, فبراير، 2024, ص 15-22, https://doi.org/10.62050/ljsir2024.v2n1.275.