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Tennie, Claudio; Hedwig, Daniela; Call, Josep; Tomasello, Michael (2008). "An experimental study of nettle feeding in captive gorillas". American Journal of Primatology. 70 (6): 584–593. doi:10.1002/ajp.20532. PMID18330896. S2CID16166264.
Tennie, Claudio; Hedwig, Daniela; Call, Josep; Tomasello, Michael (2008). "An experimental study of nettle feeding in captive gorillas". American Journal of Primatology. 70 (6): 584–593. doi:10.1002/ajp.20532. PMID18330896. S2CID16166264.
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Semaw, Sileshi (2006). "The Oldest Stone Artifacts from Gona (2.6-2.5 Ma), Afar, Ethiopia: Implications for understanding the earliest stages of stone knapping". In Schick, Kathy Diane; Toth, Nicholas Patrick (eds.). The Oldowan : case studies into the earliest Stone Age. Gosport, IN: Stone Age Institute. pp. 43–75. ISBN978-0-9792276-0-8. OCLC144645362.