Selection of references used:
- 1: C.H.Frith, Cromwell, 1935, Mackays Limited Chatham (1935)
- 2: Anthony Cheetham, Life and times of Richard III, ISBN:0-297-83167-4, Weidenfield and Nicolson
- 3: Peter Potter, Data Donation
- 4: John J. Robinson, Born in Blood, ISBN:0-87131-602-1, M. Evans & Company / New York, Geoff Bath
- 5: R. L. Storey, The Medieval World 800 - 1490, ISBN:0-09-178264-3
- 6: Z.N. Brooke, A History of Europe
- 7: John Harvey, English Cathedrals, 1961, Batsford (1961)
- 8: John H Harvey, Henry Yevele, LIfe of an English Architect