Columbia subject headings:
Langland, William, 1330?-1400?--Influence.
Spenser, Edmund, 1552?-1599--Criticism and interpretation.
Harvard subject headings:
Langland, William, 1330?-1400?--Influence.
Spenser, Edmund, 1552?-1599--Criticism and interpretation.
Princeton subject headings:
Langland, William, 1330?-1400? Piers Plowman.
Langland, William, 1330?-1400?--Influence.
Langland, William, 1330?-1400?--Religion and ethics.
Spenser, Edmund, 1552?-1599--Ethics.
Spenser, Edmund, 1552?-1599--Religion.
Spenser, Edmund, 1552?-1599. Faerie queene.