Columbia subject headings:
Harvard subject headings:
Bilingualism
Bilingualism--Germany.
Bilingualism--Poland.
Education, Bilingual--Germany.
Education, Bilingual--Poland.
German language--Study and teaching
German language.
Languages in contact--Germany.
Languages in contact--Poland.
Polish language.
Princeton subject headings:
Bilingualism--Poland.
Bilingualism.
German language--Study and teaching.