Chala, Dubale Befikadu, and Yonas Ragassa Beyene. “Rural Energy Sources and Energy Consumption Pattern in Selected Districts of Jimma and Illubabor Zones, South-Western Ethiopia”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 17, no. 1, Oct. 2014, pp. 325-9, https://gssrr.org/JournalOfBasicAndApplied/article/view/2952.