Collin, B. (1955). The riddle of a 13th century sword-belt: By Bertha Collin. The Heraldry Society.
Chicago-viite (17. p.)Collin, Bertha. The Riddle of a 13th Century Sword-belt: By Bertha Collin. East Knoyle, Wiltshire: The Heraldry Society, 1955.
MLA-viite (8. p.)Collin, Bertha. The Riddle of a 13th Century Sword-belt: By Bertha Collin. The Heraldry Society, 1955.
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