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Groves, C. P. 1999. The taxonomy of orang-utans. Direktoraat Jenderal Perlindungen dan Koservasi Alam, World Wildlife Fund, Indonesia, and Center for Environmental Research and Conservation (CERC), Columbia University, Jakarta, Indonesia, New York, USA. |
| Citation: | Ancrenaz, M., Marshall, A., Goossens, B., van Schaik, C., Sugardjito, J., Gumal, M. & Wich, S. 2008. Pongo pygmaeus ssp. wurmbii. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 19 June 2013. |
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