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J. C. A. Joordens, G. Dupont-Nivet, C. S. Feibel, F. Spoor, M. J. Sier, J. H. J. L. van der Lubbe, T. K. Nielsen, M. V. Knul, G. R. Davies, and H. B. Vonhof. Improved age control on early Homo fossils from the upper Burgi Member at Koobi Fora, Kenya. J. Hum. Evol., volume 65, issue 6, pages 731-745, 2013.

M. G. Leakey, F. Spoor, M. C. Dean, C. S. Feibel, S. C. Ant\'on, C. Kiarie, and L. N. Leakey. New fossils from Koobi Fora in northern Kenya confirm taxonomic diversity in early Homo. Nature, volume 488, issue 7410, pages 201-204, August 2012.

C. S. Feibel, C. J. Lepre, and R. L. Quinn. Stratigraphy, correlation, and age estimates for fossils from Area 123, Koobi Fora. Journal of Human Evolution, volume 57, issue 2, pages 112-122, 2009.

I. McDougall and C. S. Feibel. Numerical age control for the Miocene-Pliocene succession at Lothagam, a Hominoid-bearing sequence in the Northern Kenya Rift. Lothagam : the dawn of Humanity in eastern Africa, Columbia University Press, pages 43-64, 2003.

H. Roche, J.-P. Brugal, A. Delagnes, C. S. Feibel, S. Harmand, M. Kibunjia, S. Prat, and P.-J. Texier. Les sites archéologiques plio-pléistocènes de la formation de Nachukui, Ouest-Turkana, Kenya : bilan synthétique 1997-2001. Comptes Rendus Palevol, volume 2, issue 8, pages 663-673, 2003.

C. S. Feibel. Stratigraphy and depositional setting of the Pliocene Kanapoi Formation, lower Kerio Valley, Kenya. Geology and vertebrate paleontology of the early Pliocene site of Kanapoi, Northern Kenya, Allen Press, volume 498, pages 9-20, 2003.

I. McDougall and C. S. Feibel. Numerical age control for the Miocene-Pliocene succession at Lothagam, a hominoid-bearing sequence in the northern Kenya Rift. Journal of the Geological Society, London, volume 156, pages 731-745, 1999.

M. G. Leakey, C. S. Feibel, I. McDougall, C. V. Ward, and A. C. Walker. New specimens and confirmation of an early age for Australopithecus anamensis. Nature, volume 393, pages 62-66, 1998.

M. G. Leakey, C. S. Feibel, I. McDougall, and A. Walker. New four-million-year-old hominid species from Kanapoi and Allia Bay, Kenya. Nature, volume 376, issue 6541, pages 565-571, August 1995.

K. Coffing, C. S. Feibel, M. G. Leakey, and A. C. Walker. Four-million-year-old hominids from East Lake Turkana, Kenya. American Journal of Physical Anthropology, volume 93, pages 55-65, 1994.

C. S. Feibel, F. H. Brown, and I. McDougall. Stratigraphic context of fossil hominids from the Omo group deposits: Northern Turkana Basin, Kenya and Ethiopia. Am. J. Phys. Anthropol., volume 78, issue 4, pages 595-622, 1989.

F. Brown and C. Feibel. Stratigraphical notes on the Okote Tuff Complex at Koobi Fora, Kenya. Nature, volume 316, pages 794-797, 1985.