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Brodkorb, Pierce; Mourer-Chauviré, Cécile (January 1982). "Fossil Anhingas (Aves: Anhingidae) from Early Man Sites of Hadar and Omo (Ethiopia) and Olduvai Gorge (Tanzania)". Geobios. 15 (4): 505–515. Bibcode:1982Geobi..15..505B. doi:10.1016/S0016-6995(82)80071-5.
Werdelin, Lars; Lewis, Margaret E. (2008). "New Species of Crocuta from the Early Pliocene of Kenya, with an Overview of Early Pliocene Hyenas of Eastern Africa". Journal of Vertebrate Paleontology. 28 (4): 1162–1170. Bibcode:2008JVPal..28.1162W. doi:10.1671/0272-4634-28.4.1162. JSTOR20491047.
Kalb, Jon E.; Mebrate, Assefa; Tischler, Doris (1993). "Fossil Elephantoids: From the Hominid-Bearing Awash Group, Middle Awash Valley, Afar Depression, Ethiopia". Transactions of the American Philosophical Society. 83 (1): i–114. doi:10.2307/1006558. JSTOR1006558.
Frost, Stephen R.; Delson, Eric (November 2002). "Fossil Cercopithecidae from the Hadar Formation and surrounding areas of the Afar Depression, Ethiopia". Journal of Human Evolution. 43 (5): 687–748. doi:10.1006/jhev.2002.0603. PMID12457855.