Negash, Agazi Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Max Planck Society;
Negash, A., Alene, M., Brown, F. H., Nash, B. P., & Shackley, M. S. (2007). Geochemical sources for the terminal Pleistocene/early Holocene obsidian artifacts of the site of Beseka, central Ethiopia. Journal of Archaeological Science, 34(8), 1205-1210. doi:10.1016/j.jas.2006.10.010.