E.N. Ogbonna Eric Nnamdi, Ngozi Sunday Gideon, and Ibegbulam Onyinyechi Zebulon, “Factorials Experiment for Directly Observed Treatment Short Course (Dots): Treatment of Tuberculosis Infection in Abia State, Nigeria”, IJASRE, vol. 4, no. 10, pp. 63–68, Oct. 2018.