Guxman, M.M., 1968, "Some general regularities in the formation and development of national languages" in Fishman, J.A. (ed.) Readings in the Sociology of Language, Haga: Mouton, 766-779. GI-03; GI-05; GI-19; AR-03; LA-03; MA-02; PA-05 Gako-hitzak: Hizkuntza (nazionala)