Columbia subject headings:
Harvard subject headings:
Hittite language--Phonology.
Indo-European languages--Grammar.
Indo-European languages--Morphology.
Indo-European languages--Phonology.
Language and languages--Origin
Laryngeals (Phonetics)
Princeton subject headings:
Hittite language--Phonology.
Indo-European languages--Grammar.
Indo-European languages--Morphology.
Indo-European languages--Phonology.
Language and languages--Origin.
Laryngeals (Phonetics)