Jelaskan Sumber Kedua dari Richard II dari Inggris

Alexander, Jonathan & Binksi, Paul (eds), Age of Chivalry, Art in Plantagenet England, 1200-1400, Royal Academy/Weidenfeld & Nicholson, London 1987

Levey, Michael, Painting at Court, Weidenfeld and Nicholson, London, 1971