1. Antón, S. C., & Swisher, C. C., III. (2004). Early dispersals of Homo from Africa. Annual Review of Anthropology, 33, 271–296.
2. Bao, T.V., & Kha, L.T. (1966). Report on paleontological and paleoanthropological research at Tham Khuyen, Binh Gia District (Lang Son Province). Documents of the Institute of Archaeology, Hanoi (in Vietnamese).
3. Barbour, G. B., Licent, E., & Teilhard de Chardin, P. (1926). Geological study of the deposits of the San Kan Ho Basin. Bulletin of the Geological Sciences of China, 5, 263–278.
4. Bettis III, E.A., Zaim, Y., Larick, R.R., Ciochon, R.L., Suminto, Rizal, Y., Reagan, M., et al. (2004). Landscape development preceding Homo erectus immigration into Central Java, Indonesia: the Sangiran formation lower lahar. Palaeogeography, Palaeoclimatology, Palaeoecology 206, 115–131.
5. Bettis III, E.A., Milius, A.K., Carpenter, S.J., Larick, R.R., Zaim, Y., Rizal, Y., et al. (2009). Way out of Africa: Early Pleistocene paleoenvironments inhabited by Homo erectus in Sangiran, Java. Journal of Human Evolution 56, 11–24.