J. Kappelman, C. C. Swisher III, J. G. Fleagle, S. Yirga, T. M. Bown, and M. Feseha. Age of Australopithecus afarensis from Fejej, Ethiopia. Journal of Human Evolution, volume 30, issue 2, pages 139-146, 1996.

J. G. Fleagle, T. D. Rasmussen, S. Yirga, T. M. Bown, and F. E. Grine. New hominid fossils from Fejej, Southern Ethiopia. Journal of Human Evolution, volume 21, pages 145-152, 1991.