Columbia subject headings:
Harvard subject headings:
English language--Pronunciation by foreign speakers
Language acquisition--Age factors.
Language and languages--Study and teaching--Physiological aspects.
Polish language--Pronunciation by foreign speakers.
Second language acquisition.
Princeton subject headings:
English language--Pronunciation by foreign speakers.
Language acquisition--Age factors.
Language and languages--Study and teaching--Physiological aspects.
Polish language--Pronunciation by foreign speakers.
Second language acquisition.