Columbia subject headings:
Langland, William, 1330?-1400? Piers Plowman.
Harvard subject headings:
Christian poetry, English (Middle)--Criticism, Textual.
Langland, William, 1330?-1400? Piers Plowman.
Princeton subject headings:
Langland, William, 1330?-1400? Piers Plowman.
Langland, William, 1330?-1400?--Criticism and interpretation.