Fritz, Gerd. 1988. “Change of meaning and change of vocabulary”. In Norbert Dittmar and Peter Schlobinski, eds. The Sociolinguistics of Urban Vernaculars: Case Studies and their Evaluation. Berlin: de Gruyter, 1614–31.
Macaulay, Ronald K. S.1977. Language, Social Class and Education: a Glasgow Study. Edinburgh: University Press.