KRAUS,SLAWSON. (1969). GEMS & GEM MATERIALS. MCGRAW - HILL BOOK CO.
Lua i Stíl Chicago (17ú heag.)KRAUS,SLAWSON. GEMS & GEM MATERIALS. NEW YORK: MCGRAW - HILL BOOK CO, 1969.
Lua MLA (9ú heag.)KRAUS,SLAWSON. GEMS & GEM MATERIALS. MCGRAW - HILL BOOK CO, 1969.
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