Thlakma SR, Tukur MM, HENA MK, Abare ML, Muhammad K A. GIS-Based Underground Water Quality Risk Mapping of Kaltungo L.G.A, Gombe State, Nigeria. ASRJETS-Journal. 2018;44(1):264-277. Accessed November 9, 2025. https://asrjetsjournal.org/American_Scientific_Journal/article/view/4077