(en) Ronald Edward Zupko, A Dictionary of weights and measures for the British Isles : the Middle ages to the twentieth century, Philadelphie, American Philosophical Society, , 520 p. (ISBN0-87169-168-X et 978-0-87169-168-2, OCLC13643353, lire en ligne)
(en) F. M Stenton et Reginald Hugh Michael DOLLEY, Anglo-Saxon Coins. Studies presented to F.M. Stenton on the occasion of his 80th birthday, 17 May 1960. Edited by R.H.M. Dolley., London, , avec des illustrations dont un portrait (OCLC504599595, lire en ligne), p. 266-283