1. Allen, M 2001, ‘The chronology, mints, and moneyers of the English coinage, 1180–1247’, in J P Mass (ed), The J. P. Mass Collection. English Short Cross Coins, 1180–1247, Sylloge of Coins of the British Isles 56, Oxford: Oxford University Press, 1–12.
2. Archibald, M 2011, ‘Testing’, in J Graham-Campbell, The Cuerdale Hoard and Related Viking-Age Silver and Gold from Britain and Ireland in the British Museum, British Museum Research Publication No 185, London: British Museum Press, 51–64.
3. The Barony and Castle of Langley;Bates C J;Archaeologia Aeliana ser,1885
4. Merowingerzeit: die Altertümer im Museum für Vor- und Frühgeschichte;Bertram M;Zaberns Bildbände zur Archäologie,1995
5. Currency under the Vikings. Part 1: Guthrum and the earliest Danelaw coinages;Blackburn M;British Numismatic Journal,2005