(באנגלית) לפי אנציקלופדיה בריטניקה Alexander IV | Crusades, Papal States, Interregnum | Britannica, www.britannica.com (באנגלית) P. Touron, "Alexandre IV contre
London: Frederick Warne LTD. pp. 205–222. ISBN 0-7232-2096-4. heraldry - coat of arms, King George III United Kingdom: Flags of the Interregnum, 1649-1660
Ordinances of the Interregnum, 1642-1660. Originally published by His Majesty's Stationery Office, London, 1911. "The Parliament of England taking into their