Selection of references used:
- 1: John J. Robinson, Born in Blood, ISBN:0-87131-602-1, M. Evans & Company / New York, Geoff Bath
- 2: Duc de Castries, The lives of the Kings and Queens of France, ISBN:0-297-77676-2, Erdington Library
- 3: M H Keen, England in the Later Middle Ages, ISBN:0-415-02783-7, Erdington Library