Columbia subject headings:
Harvard subject headings:
Richard III, King of England, 1452-1485.
Richard, Duke of York, 1472-1483
Warbeck, Perkin, 1474-1499.
Princeton subject headings:
Edward V, King of England, 1470-1483--Assassination.
Great Britain--History--House of York, 1461-1485.
Richard III, King of England, 1452-1485.
Richard, Duke of York, 1411-1460.
Warbeck, Perkin, 1474-1499.