Gemological Institute of America & American Gem Society. Gems & gemology. Gemological Institute of America.
Čikaški stil citiranja (17. izdanje)Gemological Institute of America i American Gem Society. Gems & Gemology. Santa Monica [etc.]: Gemological Institute of America.
MLA način citiranja (8. izdanje)Gemological Institute of America i American Gem Society. Gems & Gemology. Gemological Institute of America.
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