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Backwell, L; d'Errico, F; Wadley, L (2008). "Middle Stone Age bone tools from the Howiesons Poort layers, Sibudu Cave, South Africa". Journal of Archaeological Science. 35 (6): 1566–1580. Bibcode:2008JArSc..35.1566B. doi:10.1016/j.jas.2007.11.006.
d'Errico, F; Henshilwood, C; Vanhaeren, M; van Niekerk, K (January 2005). "Nassarius kraussianus shell beads from Blombos Cave: evidence for symbolic behaviour in the Middle Stone Age". J. Hum. Evol. 48 (1): 3–24. doi:10.1016/j.jhevol.2004.09.002. PMID15656934.
Lombard M, Phillips L (2010). "Indications of bow and stone-tipped arrow use 64,000 years ago in KwaZulu-Natal, South Africa". Antiquity. 84 (325): 635–648. doi:10.1017/S0003598X00100134. S2CID162438490.