Ancrenaz, M., Gumal, M., Marshall, A.J., Meijaard, E., Wich , S.A. & Husson, S. 2016. Pongo pygmaeus. The IUCN Red List of Threatened Species 2016: e.T17975A17966347.
M. Goodman; D. A. Tagle; D. H. Fitch; W. Bailey; J. Czelusniak; B. F. Koop; P. Benson; J. L. Slightom (1990). "Primate evolution at the DNA level and a classification of hominoids". Journal of Molecular Evolution. 30 (3): 260–266. doi:10.1007/BF02099995. PMID2109087.
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M. Goodman; D. A. Tagle; D. H. Fitch; W. Bailey; J. Czelusniak; B. F. Koop; P. Benson; J. L. Slightom (1990). "Primate evolution at the DNA level and a classification of hominoids". Journal of Molecular Evolution. 30 (3): 260–266. doi:10.1007/BF02099995. PMID2109087.