Viking Coinage and Currency in the British Isles | British Numismatic Society Special Publication No. 7 by Mark Blackburn
The Durham Mint by Allen, M.
The Abbey and Mint of Bury St Edmunds from 1279 by Eaglen, Robin J. BNS SP11
The Abbey and Mint of Bury St. Edmunds to 1279 by Eaglen, R.J.