Girma, Haile, et al. “Estimation of Technical Efficiency of Micro and Small-Scale Manufacturing Enterprises in Selected Towns of Jimma Zone, Oromia National Regional State”. Journal of Economics and Behavioral Studies, vol. 11, no. 4(J), Sept. 2019, pp. 88-101, https://doi.org/10.22610/jebs.v11i4(J).2923.