Sociolinguistic Composition of Multilingual Countries.
Ferguson (1966) General Patterns: function, status, number of speakers.
Stewart (1972) Typology of languages: standard, vernacular, pidgin, creole artificial, marginal, classical
Census Data Problems:
- self reports (prestige, ethnicity, political affiliation)
- conception of mother tongue
- differences between dialect and language.
- degree of bilingualism not specified.