Red Sea.2FHorn of Africa theory Afroasiatic Urheimat

^ ehret, christopher (1982), on antiquity of agriculture in ethiopia journal of african history (univ. of calif. berkeley press)
^ ehret c (1995) reconstructing proto-afroasiatic (proto-afrasian): vowels, tone, consonants, , vocabulary, university of california press, isbn 0-520-09799-8, isbn 978-0-520-09799-5
^ ehret c (2002a) civilizations of africa: history 1800, james currey publishers, isbn 0-85255-475-3, isbn 978-0-85255-475-3 https://books.google.com/books?id=0k0p8wcnktqc
^ ehret c (2002b) language family expansions: broadening our understandings of cause african perspective, in bellwood , renfrew (2002 eds).
^ carta: origins of us-relationships of ancient african languages. presented christopher ehret. public symposium: may 10, 2013. university of california television. https://www.youtube.com/watch?v=7btmamprlje time 27:42.
^ clutton-brock, juliet (1995), origins of dog: domestication , history , in serpell, james, domestic dog: evolution, behaviour , interactions people, cambridge: cambridge university press, isbn 0-521-41529-2
^ cite error: named reference shirai, noriyuki 2010 invoked never defined (see page).
^ lahr, m. mirazón; rivera, f.; power, r. k.; mounier, a.; copsey, b.; crivellaro, f.; edung, j. e.; fernandez, j. m. maillo; kiarie, c. (2016). inter-group violence among holocene hunter-gatherers of west turkana, kenya . nature. 529 (7586): 394–398. doi:10.1038/nature16477. pmid 26791728. 
^ m. h. monroe, aboriginal weapons , tools favoured weapon of aborigines spear , spear thrower. fact never adopted bow , arrow has been debated long time. during post-glacial times bow , arrow being used in every inhabited part of world except australia. number of reasons have been put forward [...] captain cook saw bow , arrow being used on island close mainland @ cape york, in torres strait islands , new guinea. aborigines preferred spear.