Gemological Institute of America & American Gem Society. Gems & gemology. Gemological Institute of America.
Chicagoスタイル(17版)引用形式Gemological Institute of America , American Gem Society. Gems & Gemology. Santa Monica [etc.]: Gemological Institute of America.
MLA(8版)引用形式Gemological Institute of America , American Gem Society. Gems & Gemology. Gemological Institute of America.
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