Collin, B. (1955). The riddle of a 13th century sword-belt: By Bertha Collin. The Heraldry Society.
Chicago-referens (17:e uppl.)Collin, Bertha. The Riddle of a 13th Century Sword-belt: By Bertha Collin. East Knoyle, Wiltshire: The Heraldry Society, 1955.
MLA-referens (8:e uppl.)Collin, Bertha. The Riddle of a 13th Century Sword-belt: By Bertha Collin. The Heraldry Society, 1955.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.