, 1978, Historical background of universals research, in J. Greenberg (ed.), Universals of human language, Stanford, Stanford University Press, pp. 7-32.
with Greenberg, J. , Moravcsik, E.A. (eds) , 1978, Universals of human language 4: syntax, Stanford University Press, Stanford.
, 1959a, 'Diglossia', Word 15, 325-340.