Guebelin, E. (1961). Hydrothermal Rubies and emerald-coated beryl.
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Citação norma Chicago
Guebelin, Eduard. Hydrothermal Rubies and Emerald-coated Beryl. [London], 1961.
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Citação norma MLA
Guebelin, Eduard. Hydrothermal Rubies and Emerald-coated Beryl. 1961.
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Nota: a formatação da citação pode não corresponder 100% ao definido pela respectiva norma.