Columbia subject headings:
Bilingualism--Japan.
Language and education--Japan.
Second language acquisition.
Social networks--Japan.
Sociolinguistics--Japan.
Harvard subject headings:
Bilingualism--Japan.
Language and education--Japan.
Second language acquisition.
Social networks--Japan.
Sociolinguistics--Japan.
Princeton subject headings:
Bilingualism--Japan.
Language and education--Japan.
Second language acquisition.
Social networks--Japan.
Sociolinguistics--Japan.