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==Bibliographia==
*Joseph Greenberg, ''Genetic Linguistics: Essays on Theory and Method'' ed. William Croft. Oxoniae: Oxford University Press, 2005.
*Sydney M. Lamb et E. Douglas Mitchell, edd., ''Sprung from Some Common Source: investigations into the prehistory of languages''. Stanford: Stanford University Press 1991.
*[[Merritt Ruhlen]], ''A Guide to the World's Languages''. Londinii: Edward Arnold, 1987; 2a ed. 1991.
 
[[Categoria:Familiae linguarum|!]]