Collin, B. (1955). The riddle of a 13th century sword-belt: By Bertha Collin. The Heraldry Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCollin, Bertha. The Riddle of a 13th Century Sword-belt: By Bertha Collin. East Knoyle, Wiltshire: The Heraldry Society, 1955.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCollin, Bertha. The Riddle of a 13th Century Sword-belt: By Bertha Collin. The Heraldry Society, 1955.
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