W. Njiru, Christine, et al. “Socio-Economic Factors of Small Hydropower and Biogas Plants and Their Implications for Rural Energy Poverty Alleviation in Kirinyaga, Kenya”. JNRD - Journal of Natural Resources and Development, vol. 8, Oct. 2018, pp. 101-14, https://doi.org/10.5027/jnrd.v8i0.10.