[1] The Blazon of Episcopacy Rev. W.K. Riland Bedford 1858 Larman Bequest Dc255
[2] Warren's Book (Ed. 1911 by A.W.W.Dale)
[3] Crawley's book (1975)
[4] An Alphabetical Dictionary of Coats of Arms John W. Papworth. Larman Bequest Dc419-20
[5] History of Norfolk F. Blomefield
[6] General Armoury.
For general reading on heraldry Heraldica is a good start. CUH&GS is the Cambridge University Heraldic and Genealogical Society.
Trinity Hall has a web site which contains a brief history.