↑ François, Alexandre (2014), "Trees, Waves and Linkages: Models of Language Diversification" (PDF), in Bowern, Claire; Evans, Bethwyn (eds.), The Routledge Handbook of Historical Linguistics, London: Routledge, pp. 161–189, ISBN 978-0-41552-789-7.
↑ Nichols, Johanna. Monogenesis or Polygenesis: A Single Ancestral Language for All Humanity? Ch. 58 of The Oxford Handbook of Language Evolution, ed. by Maggie Tallerman and Kathleen Rita Gibson. Oxford: Oxford UP, 2012. 558-72. Print.
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