Columbia subject headings:
Greenberg, Joseph H. (Joseph Harold), 1915-2001.
Language and languages--Classification.
Typology (Linguistics)
Harvard subject headings:
Greenberg, Joseph H. (Joseph Harold), 1915-2001.
Language and languages--Classification
Typology (Linguistics)
Princeton subject headings:
Greenberg, Joseph H. (Joseph Harold), 1915-2001.
Language and languages--Classification.