Columbia subject headings:
Polish language--Grammar, Generative.
Polish language--Morphophonemics.
Polish language--Vowels.
Harvard subject headings:
Polish language--Grammar, Generative.
Polish language--Morphophonemics.
Polish language--Vowels.
Princeton subject headings:
Polish language--Grammar, Generative.
Polish language--Phonology.
Polish language--Vowels.