Columbia subject headings:
Bilingualism.
English language--Study and teaching--Foreign speakers.
Sociolinguistics.
Harvard subject headings:
Bilingualism.
English language--Foreign countries
English language--Study and teaching--Foreign speakers
English language--Variation--Foreign countries
Sociolinguistics.
Princeton subject headings:
Bilingualism.
English language--Study and teaching--Foreign speakers.
Sociolinguistics.