Sofianides, A. S., & Harlow, G. E. (2015). Gems & crystals from one of the world's great collections (Revised edition.). Sterling Signature.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSofianides, Anna S., और George E. Harlow. Gems & Crystals from One of the World's Great Collections. Revised edition. New York: Sterling Signature, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रSofianides, Anna S., और George E. Harlow. Gems & Crystals from One of the World's Great Collections. Revised edition. Sterling Signature, 2015.
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