Cita APA

Gemological Institute of America & American Gem Society. Gems & gemology. Gemological Institute of America.

Citación estilo Chicago

Gemological Institute of America and American Gem Society. Gems & Gemology. Santa Monica [etc.]: Gemological Institute of America.

Cita MLA

Gemological Institute of America and American Gem Society. Gems & Gemology. Gemological Institute of America.