Columbia subject headings:
Communicative competence.
Contrastive linguistics.
Language and languages--Study and teaching.
Language and languages--Style.
Sociolinguistics.
Harvard subject headings:
Communicative competence.
Contrastive linguistics.
Language and languages--Study and teaching
Language and languages--Style
Sociolinguistics.
Princeton subject headings:
Communicative competence.
Contrastive linguistics.
Language and languages--Study and teaching.
Language and languages--Style.
Sociolinguistics.