Usman, M.A., Salawu, Y., Yakasai, I.A, Bello, I., and Awwalu, S, “DETERMINATION OF SOME HEAVY METALS IN FORAGE GRASSES IN ZUNGERU NIGER STATE, NORTH CENTRAL, NIGERIA”, BIMA, vol. 2, no. 02, pp. 152-159, Jun. 2018.