A. Dare, S. O. Okechalu, B. Amos, T. O. Ademola, and G. L. Luka, “SOIL SPATIAL VARIABILITY OF SOME SOIL PROPERTIES USING FACTOR ANALYSIS IN FEDERAL COLLEGE OF FORESTRY MECHANIZATION, KADUNA RESEARCH FARM”, FJS, vol. 4, no. 2, pp. 695 - 698, Oct. 2020.