Here is a list of definite, probable and possible sources for Richard III: 

  •  The Union of the Two Noble and Illustre Famelies of Lancastre and Yorke by Edward Hall
  • A Myrroure for Magistrates
  • Richardus Tertius by Thomas Legge
  • Hercules Furens by Seneca
  • The True Tragedy of Richard III, Anonymous
  • The Rose of Englande, Anonymous
For further information, see: Bullough, Geoffrey. Narrative and Dramatic Sources of Shakespeare, Volume III: Earlier English History Plays. London: Routledge and Kegan Paul, 1975.
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