^Roos, C. & Geissmann, T. 2001. Molecular phylogeny of the major hylobatid divisions. Molecular Phylogenetics and Evolution, 19, 486-494.
^Brandon-Jones, D., Eudey, A. A., Geissmann, T., Groves, C. P., Melnick, D. J., Morales, J. C., Shekelle, M. & Stewart, C. B. 2004. Asian primate classification. International Journal of Primatology, 25, 97-164.