Columbia subject headings:
Chaucer, Geoffrey, -1400--Language.
English language--Middle English, 1100-1500--Grammar.
Harvard subject headings:
Chaucer, Geoffrey, -1400--Language.
English language--Middle English, 1100-1500--Grammar
Princeton subject headings:
Chaucer, Geoffrey, -1400--Language--Grammar.
English language--Middle English, 1100-1500--Grammar.