Nonga, H., Mdegela, R., Lie, E., Sandvik, M. and Skaare, J. (2011) “Socio-economic values of wetland resources around Lake Manyara, Tanzania: assessment of environmental threats and local community awareness on environmental degradation and their effects”, Journal of Wetlands Ecology, 4, pp. 83–101. doi: 10.3126/jowe.v4i0.4153.