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Bengtson, John D. 2007. "On fossil dinosaurs and fossil words".

Campbell, Lyle, and William J. Poser. 2008. Language Classification: History and Method. Cambridge: Cambridge University Press.

Gell-Mann, Murray and Merritt Ruhlen. 2003. "The origin and evolution of syntax". (Also: HTML version.)

Givón, Talmy. 1979. On Understanding Grammar. New York: Academic Press.

Greenberg, Joseph. 1963. "Some universals of grammar with particular reference to the order of meaningful elements". In Universals of Language, edited by Joseph Greenberg, Cambridge: MIT Press, pp. 58–90. (In second edition of Universals of Language, 1966: pp. 73–113.)

Greenberg, Joseph H. 1966. The Languages of Africa, revised edition. Bloomington: Indiana University Press. (Published simultaneously at The Hague by Mouton & Co.)

Greenberg, Joseph H. 1971. "The Indo-Pacific hypothesis". Reprinted in Joseph H. Greenberg, Genetic Linguistics: Essays on Theory and Method, edited by William Croft, Oxford: Oxford University Press, 2005.

Greenberg, Joseph H. 2000–2002. Indo-European and Its Closest Relatives: The Eurasiatic Language Family. Volume 1: Grammar. Volume 2: Lexicon. Stanford: Stanford University Press.

Klein, Richard G. and Blake Edgar. 2002. The Dawn of Human Culture. New York: John Wiley and Sons.

Nandi, Owi Ivar. 2012. Human Language Evolution, as Coframed by Behavioral and Psychological Universalisms, Bloomington: iUniverse Publishers.

Wells, Spencer. 2007. Deep Ancestry: Inside the Genographic Project. Washington, D.C.: National Geographic.