Kalpers, J., Williamson, E.A., Robbins, M.M., McNeilage, A., Nzamurambaho, A., Lola, N. and Mugiri, G., 2003. Gorillas in the crossfire: population dynamics of the Virunga Mountain gorillas over the past three decades. Oryx, 37(3), pp.326-337.
Kalpers, J., Williamson, E.A., Robbins, M.M., McNeilage, A., Nzamurambaho, A., Lola, N. and Mugiri, G., 2003. Gorillas in the crossfire: population dynamics of the Virunga Mountain gorillas over the past three decades. Oryx, 37(3), pp.326-337.