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Zhengzhang, Tao (July 1991). "On the origin of the carat as the unit of weight for gemstones". Chinese Journal of Geochemistry. 10 (3): 288–293. doi:10.1007/BF02843332. ISSN1993-0364. S2CID127800966.
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Liddell, Henry George; Scott, Robert. "κέρας". A Greek-English Lexicon. Archived from the original on 2012-10-08. Retrieved 2021-02-20 – via Perseus.Tufts.edu.
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Zhengzhang, Tao (July 1991). "On the origin of the carat as the unit of weight for gemstones". Chinese Journal of Geochemistry. 10 (3): 288–293. doi:10.1007/BF02843332. ISSN1993-0364. S2CID127800966.
yourdiamondteacher.com
Naturski, Sebastian. "Carat Weight". Your Diamond Teacher. Retrieved 3 March 2017.