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Tata, H. L. and van Noordwijk, M. 2010. Human Livelihoods, Ecosystem Services and the Habitat of the Sumatran Orangutan: Rapid Assessment in Batang Toru and Tripa. Bogor, Indonesia: World Agroforestry Centre/ICRAF Southeast Asia Regional Office. Wich, S.A., Meijaard, E., Marshall, A.J., Husson, S., Ancrenaz, M., Lacy, R.C., van Schaik, C.P., Sugardjito, J., Simorangkir, T., Taylor-Holzer, K., Doughty, M., Supriatna, J., Dennis, R., Gumal, M., Knott, C.D. and Single-ton, I. 2008. Distribution and conservation status of the orangutan (Pongo spp.) on Borneo and Sumatra: How many remain? Oryx 42: 329-339