B. Asfaw, W. H. Gilbert, and G. D. Richards. 13. Homo erectus Cranial Anatomy. Homo erectus, pages 265-328, 2019. T. D. White, B. Asfaw, D. DeGusta, H. Gilbert, G. D. Richards, G. Suwa, and F. C. Howell. Pleistocene Homo sapiens from Middle Awash, Ethiopia. Nature, volume 423, issue 6941, pages 742-747, June 2003.