The origin of language tracing the evolution of the mother tongue

Bibliográfalaš dieđut
Váldodahkki:	Ruhlen, Merritt 1944-
Materiálatiipa:	Girji
Giella:	eaŋgalasgiella
Almmustuhtton:	New York Wiley c1994.
Fáttát:	Language and languages > Origin. Human evolution. Language and languages > Classification.