1. Badoux, D. M., 1959. Fossil mammals from two fissure deposits at Punung (Java). Thesis, Univ. Utrecht, Kemink en Zoon N. V., Utrecht.
2. Deninger, K., 1910. Ueber einen Affenkiefer aus den Kendengschichten von Java.Centralbl. f. Mineralogie, 1910, pp. 1–3.
3. Es, L. J. C. van, 1931.The Age of Pithecanthropus. Martinus Nijhoff, the Hague.
4. Fooden, J., 1975. Taxonomy and evolution of liontail and pigtail macaques (Primates: Cercopithecidae).Fieldiana, Zool., 67: 1–169.
5. Hooijer, D. A., 1962. Quaternary langurs and macaques from the Malay Archipelago.Zool. Verh. Rijksmus. Nat. Hist. Leiden, 55: 1–64.