18.↑ Yong, Ed (15 March 2018). "A Cultural Leap at the Dawn of Humanity – New finds from Kenya suggest that humans used long-distance trade networks, sophisticated tools, and symbolic pigments right from the dawn of our species". The Atlantic. 17 November 2020 දින පැවති මුල් පිටපත වෙතින් සංරක්ෂිත පිටපත. සම්ප්‍රවේශය 15 March 2018.↑ Brooks AS, Yellen JE, Potts R, Behrensmeyer AK, Deino AL, Leslie DE, Ambrose SH, Ferguson JR, d'Errico F, Zipkin AM, Whittaker S, Post J, Veatch EG, Foecke K, Clark JB (2018). "Long-distance stone transport and pigment use in the earliest Middle Stone Age". Science. 360 (6384): 90–94. Bibcode:2018Sci...360...90B. doi:10.1126/science.aao2646. PMID 29545508.↑ 35.0 35.1 Ehret, C. (2002) The Civilizations of Africa: a History to 1800, University Press of Virginia, ISBN 0-8139-2085-X.↑ Ehret, C. (1980) The historical reconstruction of Southern Cushitic phonology and vocabulary, Kölner Beiträge zur Afrikanistik 5, Bd., Reimer, Berlin.↑ Ehret, C. (1983) Cu