Tuck, Anthony (2004). "Edmund, first duke of York (1341–1402)". Oxford Dictionary of National Biography. Oxford: Oxford University Press. doi:10.1093/ref:odnb/16023.
Alexander and Binski, pp. 202–203, 506. It is documented in the royal collection from 1399 and accompanied Blanche, daughter of Henry IV, to her Bavarian marriage. It is still in Munich. imageArchived 31 October 2008 at the Wayback Machine See also Richard's Treasure roll, The Institute of Historical Research and Royal Holloway. Retrieved 12 October 2008.
Alexander and Binski, pp. 202–203, 506. It is documented in the royal collection from 1399 and accompanied Blanche, daughter of Henry IV, to her Bavarian marriage. It is still in Munich. imageArchived 31 October 2008 at the Wayback Machine See also Richard's Treasure roll, The Institute of Historical Research and Royal Holloway. Retrieved 12 October 2008.