READ,P&MIERE. (1983). GEMMOLOGICAL INSTRUMENT. MAGRAW HILL.
Lua i Stíl Chicago (17ú heag.)READ,P&MIERE. GEMMOLOGICAL INSTRUMENT. LONDON: MAGRAW HILL, 1983.
Lua MLA (9ú heag.)READ,P&MIERE. GEMMOLOGICAL INSTRUMENT. MAGRAW HILL, 1983.
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